Exporting DataTable to Excel

Exporting DataTable to Excel - c#

I have a small web application that creates two datatables from a jquery datepicker. I am able to export those datatables to excel of course if they are on the same page.
I've changed my application to render the datatables on new webforms.
Here is my code to export to excel:
protected void ExportToExcel(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
using (StringWriter sw = new StringWriter())
{
HtmlTextWriter hw = new HtmlTextWriter(sw);
//To Export all pages
this.BindGrid1(TextDateFrom.Text, TextDateTo.Text);
GridView2.HeaderRow.BackColor = Color.White;
foreach (TableCell cell in GridView2.HeaderRow.Cells)
{
cell.BackColor = GridView2.HeaderStyle.BackColor;
}
foreach (GridViewRow row in GridView2.Rows)
{
row.BackColor = Color.White;
foreach (TableCell cell in row.Cells)
{
if (row.RowIndex % 2 == 0)
{
cell.BackColor = GridView2.AlternatingRowStyle.BackColor;
}
else
{
cell.BackColor = GridView2.RowStyle.BackColor;
}
cell.CssClass = "textmode";
}
}
GridView2.RenderControl(hw);
//style to format numbers to string
string style = #"<style> .textmode { } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
}
Here is where I am having trouble:
this.BindGrid1(TextDateFrom.Text, TextDateTo.Text);
Of course my BindGrid1() is an another form. To call my datatables in my new forms I created a session.
If I have the code on the web form where the data tables are:
DataTable dt = (DataTable)Session["GridData"];
if (dt.Rows.Count > 0)
{
GridView1.DataSource = dt;
GridView1.DataBind();
}
I'm not sure exactly how to call that this. to export all pages. Should I have created a global variable that takes the String values from the BindGrid1 method to then use on the new page?

Pertinent to your task, the data export from DataTable dt to Excel can be achieved using the following procedure, which utilizes Microsoft.Office.Interop.Excel object library:
/// <summary>
/// export DataTable to Excel (C#)
/// </summary>
internal static void Export2Excel(DataTable dataTable)
{
object misValue = System.Reflection.Missing.Value;
Microsoft.Office.Interop.Excel.Application _appExcel = null;
Microsoft.Office.Interop.Excel.Workbook _excelWorkbook = null;
Microsoft.Office.Interop.Excel.Worksheet _excelWorksheet = null;
try
{
// excel app object
_appExcel = new Microsoft.Office.Interop.Excel.Application();
// excel workbook object added to app
_excelWorkbook = _appExcel.Workbooks.Add(misValue);
_excelWorksheet = _appExcel.ActiveWorkbook.ActiveSheet as Microsoft.Office.Interop.Excel.Worksheet;
// column names row (range obj)
Microsoft.Office.Interop.Excel.Range _columnsNameRange;
_columnsNameRange = _excelWorksheet.get_Range("A1", misValue).get_Resize(1, dataTable.Columns.Count);
// column names array to be assigned to _columnNameRange
string[] _arrColumnNames = new string[dataTable.Columns.Count];
for (int i = 0; i < dataTable.Columns.Count; i++)
{
// array of column names
_arrColumnNames[i] = dataTable.Columns[i].ColumnName;
}
// assign array to column headers range, make 'em bold
_columnsNameRange.set_Value(misValue, _arrColumnNames);
_columnsNameRange.Font.Bold = true;
// populate data content row by row
for (int Idx = 0; Idx < dataTable.Rows.Count; Idx++)
{
_excelWorksheet.Range["A2"].Offset[Idx].Resize[1, dataTable.Columns.Count].Value =
dataTable.Rows[Idx].ItemArray;
}
// Autofit all Columns in the range
_columnsNameRange.Columns.EntireColumn.AutoFit();
}
catch { throw; }
}
just pass dt as an argument.
Hope this may help.

Related

Export HTML string to Excel file in ASP.Net using C#

I have this table in database MySql version 8.0.17 which contains HTML code on field contents
<p><h3><span style=color:#0000ff;><strong>test</strong></span></h3></p>
<h4><strong>- test1</strong></h4>
<h4><strong>- test2</strong></h4>
I am not DB admin so I can only read from this table which i cannot modify..
when exporting this table in excel format on the xls file all HTML tags are found
How to do resolve this?
Thanks in advance for any help.
My code below
private void MTxlssp()
{
MySqlCommand cmd =
new MySqlCommand("SP");
DataTable dt = GetData(cmd);
GridView GridView1 = new GridView
{
AllowPaging = false,
DataSource = dt
};
GridView1.DataBind();
Thread.Sleep(3000);
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", attachment;filename=\"test.xls\"");
Response.ContentEncoding = Encoding.UTF8;
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
HttpCookie cookie2 = new HttpCookie("ExcelDownloadFlag")
{
Value = "Flag",
Expires = DateTime.Now.AddDays(1)
};
Response.AppendCookie(cookie2);
using (StringWriter sw = new StringWriter())
{
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.HeaderRow.BackColor = Color.White;
foreach (TableCell cell in GridView1.HeaderRow.Cells)
{
cell.BackColor = GridView1.HeaderStyle.BackColor;
}
foreach (GridViewRow row in GridView1.Rows)
{
row.BackColor = Color.White;
foreach (TableCell cell in row.Cells)
{
if (row.RowIndex % 2 == 0)
{
cell.BackColor = GridView1.AlternatingRowStyle.BackColor;
}
else
{
cell.BackColor = GridView1.RowStyle.BackColor;
}
cell.CssClass = "textmode";
}
}
GridView1.RenderControl(hw);
string style = #"<style> .textmode { } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
}

If its just the display text you need then maybe the library Nuglify will help you. It supports text extraction from HTML:
var html = #"<p><h3><span style=color:#0000ff;><strong>test</strong></span></h3></p>
<h4><strong>- test1</strong></h4>
<h4><strong>- test2</strong></h4>";
var result = Uglify.HtmlToText(html);
Console.WriteLine(result.Code);
You can download it from here: https://github.com/trullock/NUglify or get it from Nuget.
I have just run it on your html sample and it produces:
test - test1 - test2
I am assuming thats what you want based on your comment to #Ivan Khorin

Export a gridview to Excel with page orientation set to landscape?

Haven't found any good solution to export a GridView to Excel with following options :
Page orientation set to Landscape
Margins Normal
All columns fit to one page
Existing code to export to Excel is as follows
private void ExportToExcel(GridView grdGridView)
{
DataTable dt = Whatever();
grdGridView.AllowPaging = false;
grdGridView.Columns[13].Visible = false;
grdGridView.DataSource = dt;
grdGridView.DataBind();
string attachment = "attachment; filename=ExcelSheet1.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
HtmlForm frm = new HtmlForm(); // Create a form to contain the grid
grdGridView.Parent.Controls.Add(frm);
frm.Attributes["runat"] = "server";
frm.Controls.Add(grdGridView);
frm.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
}
}
What could be the best possible way to export to Excel in order to achieve all of this? Do I need to use some library or some other tool like report viewer? Is it possible or not?

Found the solution
Download epplus library.
using OfficeOpenXml;
private void ExportToExcel()
{
using (ExcelPackage objExcelPackage = new ExcelPackage())
{
//Create the worksheet
ExcelWorksheet objWorksheet = objExcelPackage.Workbook.Worksheets.Add("ExcelSheet1");
DataTable dtQuoteComparison = dt //Load the datatable into the sheet, starting from cell A1. Print the column names on row 1
objWorksheet.Cells["A1"].LoadFromDataTable(dt, true);
var start = objWorksheet.Dimension.Start;
var end = objWorksheet.Dimension.End;
for (int row = start.Row+1; row <= end.Row; row++) //iterate through rows
{
objWorksheet.Cells[rowStart, colStart, rowEnd,colEnd].WhateverProperty=value;
}
objWorksheet.PrinterSettings.Orientation = eOrientation.Landscape;
objWorksheet.PrinterSettings.FitToWidth = 1;
//Write it back to the client
if (System.IO.File.Exists(filepath))
System.IO.File.Delete(filepath);
//Create excel file on physical disk
FileStream objFileStrm = System.IO.File.Create(filepath);
objFileStrm.Close();
//Write content to excel file
System.IO.File.WriteAllBytes(filepath,objExcelPackage.GetAsByteArray());
}
}
Now the problem I am facing is that All columns fit to one page is not working even after setting
objWorksheet.PrinterSettings.FitToWidth = 1;

Export nested Gridview blank cell error

I followed this guide : Export Multi-Level Nested GridView to Excel using OpenXml in ASP.Net
And modified the code for my case as follows:
protected void ExportExcel(object sender, EventArgs e)
{
var dt = new DataTable("GridView_Data");
grvPayroll.AllowPaging = false;
var grvPayrollDetails = new GridView();
for (var i = 0; i < grvPayroll.Rows.Count; i++)
{
grvPayrollDetails = (GridView) grvPayroll.Rows[i].FindControl("grvPayrollDetails");
grvPayrollDetails.AllowPaging = false;
}
foreach (TableCell cell in grvPayrollDetails.HeaderRow.Cells)
{
if (cell.Text != " ")
{
dt.Columns.Add(cell.Text);
}
}
foreach (GridViewRow row in grvPayroll.Rows)
{
var grvPayrollDetailscell = (row.FindControl("grvPayrollDetails") as GridView);
for (var j = 0; j < grvPayrollDetailscell.Rows.Count; j++)
{
dt.Rows.Add(row.Cells[1].Text, row.Cells[2].Text, grvPayrollDetailscell.Rows[j].Cells[1].Text,
grvPayrollDetailscell.Rows[j].Cells[2].Text);
}
}
using (var wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GridView.xlsx");
using (var MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
}
No error occurred, but the export file just contain the header , all cells are empty. The export excel file with exactly the header name and the number of rows. Why? Please help!
Here is the picture:
Exported File

Adding Custom header to the excel file

Is it possible to add a custom header to the Excel while exporting a DataSet to Excel in ASP.NET?
I have one requirement like this. I can export the DataSet to the Excel successfully. But I can't add the custom header. Please help me if anybody have the solution. Thanks in advance.

IF you are using Response.Write to Export the Excel.
You can use the following code with minimal effort and the Header can be customized as you want, just like HTML headers.
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition", "attachment; filename=test.xls;");
StringWriter stringWrite = new StringWriter();
HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
dgrExport.DataSource = dtExport;
dgrExport.DataBind();
dgrExport.RenderControl(htmlWrite);
string headerTable = #"<Table><tr><td>Report Header</td></tr><tr><td><img src=""D:\\Folder\\Report Header.jpg"" \></td></tr></Table>";
Response.Write(headerTable);
Response.Write(stringWrite.ToString());
Response.End();
Mac, Are you looking for the same?

I got a little treat for you. This is a full blown Excel handler I wrote after lots of studying of Excel Interop. Look at the line "dataGridView1 = YOUR_DATATABLE_HERE;" I know it says dataGridView, it's DataTable, just FYI. Feed it that and you are golden. Of course you would need to convert a dataset to DataTable, but that's another question. Simply put, you can copy and paste this code, and all you have to change is the YOUR_DATATABLE_HERE variable with an actual DataTable and that thing will do the rest. There are lots of commented out sections. Uncomment them as needed. They should be self explanatory. Oh FYI... if your PageSetup does not work properly, that's a headache. It could be anything from you need to add a printer to some really fancy stuff, however it's host computer dependant, not code dependant. If that ends up crashing you, please comment out that section.
Notice the "#region Column Headers" part of the code. Here you can change the headers. In my code I simply pull them from the table but you can customize them. Let me know if you need help with that portion, but again, it should be self explanatory. I know this is a huge chunk of code, but the nice thing is, it's practically ready to go as-is. All you have to do is throw it in your project, feed it a DataTable, maybe add some resources (i.e. anything that's underlined red, just right click it and choose resolve), and you should be set to go for Excel anything. Good luck to you!
#region Excel Interop Object Private Methods
private void ExportToExcel()
{
#region Initialize Variables
DataTable dataGridView1 = new DataTable();
//Load source
dataGridView1 = YOUR_DATATABLE_HERE;
//Declare Excel Interop variables
Microsoft.Office.Interop.Excel.Application xlApp;
Microsoft.Office.Interop.Excel.Workbook xlWorkBook;
Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
//Initialize variables
xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
#endregion
#region Title
//Add a title
xlWorkSheet.Cells[1, 1] = "Your title here";
//Span the title across columns A through H
Microsoft.Office.Interop.Excel.Range titleRange = xlApp.get_Range(xlWorkSheet.Cells[1, "A"], xlWorkSheet.Cells[1, "F"]);
titleRange.Merge(Type.Missing);
//Center the title horizontally then vertically at the above defined range
titleRange.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
titleRange.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;
//Increase the font-size of the title
titleRange.Font.Size = 16;
//Make the title bold
titleRange.Font.Bold = true;
//Give the title background color
titleRange.Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.White);
//Set the title row height
titleRange.RowHeight = 50;
#endregion
#region Column Headers
//Populate headers, assume row[0] contains the title and row[1] contains all the headers
int iCol = 0;
foreach (DataColumn c in dataGridView1.Columns)
{
iCol++;
xlWorkSheet.Cells[2, iCol] = dgResults.Columns[iCol - 1].HeaderText;
}
//Populate rest of the data. Start at row[2] since row[1] contains title and row[0] contains headers
int iRow = 2; //We start at row 2
foreach (DataRow r in dataGridView1.Rows)
{
iRow++;
iCol = 0;
foreach (DataColumn c in dataGridView1.Columns)
{
iCol++;
xlWorkSheet.Cells[iRow, iCol] = r[c.ColumnName];
}
}
//Select the header row (row 2 aka row[1])
Microsoft.Office.Interop.Excel.Range headerRange = xlApp.get_Range(xlWorkSheet.Cells[2, "A"], xlWorkSheet.Cells[2, "F"]);
//Set the header row fonts bold
headerRange.Font.Bold = true;
//Center the header row horizontally
headerRange.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
//Put a border around the header row
headerRange.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous,
Microsoft.Office.Interop.Excel.XlBorderWeight.xlMedium,
Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic,
Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic);
//Give the header row background color
headerRange.Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.MediumPurple);
#endregion
#region Page Setup
//Set page orientation to landscape
xlWorkSheet.PageSetup.Orientation = Microsoft.Office.Interop.Excel.XlPageOrientation.xlLandscape;
//Set margins
xlWorkSheet.PageSetup.TopMargin = 0;
xlWorkSheet.PageSetup.RightMargin = 0;
xlWorkSheet.PageSetup.BottomMargin = 30;
xlWorkSheet.PageSetup.LeftMargin = 0;
//Set Header and Footer (see code list below)
//&P - the current page number.
//&N - the total number of pages.
//&B - use a bold font*.
//&I - use an italic font*.
//&U - use an underline font*.
//&& - the '&' character.
//&D - the current date.
//&T - the current time.
//&F - workbook name.
//&A - worksheet name.
//&"FontName" - use the specified font name*.
//&N - use the specified font size*.
//EXAMPLE: xlWorkSheet.PageSetup.RightFooter = "&F"
xlWorkSheet.PageSetup.RightHeader = "";
xlWorkSheet.PageSetup.CenterHeader = "";
xlWorkSheet.PageSetup.LeftHeader = "";
xlWorkSheet.PageSetup.RightFooter = "";
xlWorkSheet.PageSetup.CenterFooter = "Page &P of &N";
xlWorkSheet.PageSetup.LeftFooter = "";
//Set gridlines
xlWorkBook.Windows[1].DisplayGridlines = true;
xlWorkSheet.PageSetup.PrintGridlines = true;
#endregion
#region Worksheet Style
/*
//Color every other column but skip top two
Microsoft.Office.Interop.Excel.Range workSheetMinusHeader = xlApp.get_Range("A1", "F1");
Microsoft.Office.Interop.Excel.FormatCondition format =
(Microsoft.Office.Interop.Excel.FormatCondition)workSheetMinusHeader.EntireColumn.FormatConditions.Add(
Microsoft.Office.Interop.Excel.XlFormatConditionType.xlExpression,
Microsoft.Office.Interop.Excel.XlFormatConditionOperator.xlEqual,
"=IF(ROW()<3,,MOD(ROW(),2)=0)");
format.Interior.Color = Microsoft.Office.Interop.Excel.XlRgbColor.rgbWhiteSmoke;
//Put a border around the entire work sheet
workSheetMinusHeader.EntireColumn.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous,
Microsoft.Office.Interop.Excel.XlBorderWeight.xlMedium,
Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic,
Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic);
*/
#endregion
#region Specific Width, Height, Wrappings, and Format Types
//Set the font size and text wrap of columns for the entire worksheet
string[] strColumns = new string[] { "A", "B", "C", "D", "E", "F" };
foreach (string s in strColumns)
{
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns[s, Type.Missing]).Font.Size = 12;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns[s, Type.Missing]).WrapText = true;
}
//Set Width of individual columns
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["A", Type.Missing]).ColumnWidth = 7.00;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["B", Type.Missing]).ColumnWidth = 18.00;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["C", Type.Missing]).ColumnWidth = 18.00;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["D", Type.Missing]).ColumnWidth = 30.00;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["E", Type.Missing]).ColumnWidth = 40.00;
((Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Columns["F", Type.Missing]).ColumnWidth = 15.00;
//Select everything except title row (first row) and set row height for the selected rows
//xlWorkSheet.Range["a2", xlWorkSheet.Range["a2"].End[Microsoft.Office.Interop.Excel.XlDirection.xlDown].End[Microsoft.Office.Interop.Excel.XlDirection.xlToRight]].RowHeight = 45;
//Format date columns
//string[] dateColumns = new string[] { "N", "O", "P", "Q" };
string[] dateColumns = new string[] { };
foreach (string thisColumn in dateColumns)
{
Microsoft.Office.Interop.Excel.Range rg = (Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Cells[1, thisColumn];
rg.EntireColumn.NumberFormat = "MM/DD/YY";
}
//Format ID column and prevent long numbers from showing up as scientific notation
//Microsoft.Office.Interop.Excel.Range idRange = (Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Cells[1, "C"];
//idRange.EntireColumn.NumberFormat = "#";
//Format Social Security Numbers so that Excel does not drop the leading zeros
//Microsoft.Office.Interop.Excel.Range idRange = (Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Cells[1, "C"];
//idRange.EntireColumn.NumberFormat = "000000000";
#endregion
#region Save & Quit
//Save and quit, use SaveCopyAs since SaveAs does not always work
string fileName = Server.MapPath("~/YourFileNameHere.xls");
xlApp.DisplayAlerts = false; //Supress overwrite request
xlWorkBook.SaveAs(fileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
//Release objects
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
//Give the user the option to save the copy of the file anywhere they desire
String FilePath = Server.MapPath("~/YourFileNameHere.xls");
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment; filename=YourFileNameHere-" + DateTime.Now.ToShortDateString() + ".xls;");
response.TransmitFile(FilePath);
response.Flush();
response.Close();
//Delete the temporary file
DeleteFile(fileName);
#endregion
}
private void DeleteFile(string fileName)
{
if (File.Exists(fileName))
{
try
{
File.Delete(fileName);
}
catch (Exception ex)
{
//Could not delete the file, wait and try again
try
{
System.GC.Collect();
System.GC.WaitForPendingFinalizers();
File.Delete(fileName);
}
catch
{
//Could not delete the file still
}
}
}
}
private void releaseObject(object obj)
{
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch (Exception ex)
{
obj = null;
Response.Write("Exception Occured while releasing object " + ex.ToString());
}
finally
{
GC.Collect();
}
}
#endregion

As you are using dataset, you can change the value in the first row of the dataset if you are using that to be your column names and then export the dataset to excel:
ds.Tables[0].Rows[0][0] = "New Column Name"; // change the column value

Export DataTable to Excel File

I have a DataTable with 30+ columns and 6500+ rows.I need to dump the whole DataTable values into an Excel file.Can anyone please help with the C# code.I need each column value to be in a cell.To be precise,I need the exact looking copy of DataTable in an Excel File.Please help.
Thanks,
Vix

use this code...
dt = city.GetAllCity();//your datatable
string attachment = "attachment; filename=city.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();

This snippet could be faster to implement:
// Example data
DataTable table = new DataTable();
table.Columns.AddRange(new[]{ new DataColumn("Key"), new DataColumn("Value") });
foreach (string name in Request.ServerVariables)
table.Rows.Add(name, Request.ServerVariables[name]);
// This actually makes your HTML output to be downloaded as .xls file
Response.Clear();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=ExcelFile.xls");
// Create a dynamic control, populate and render it
GridView excel = new GridView();
excel.DataSource = table;
excel.DataBind();
excel.RenderControl(new HtmlTextWriter(Response.Output));
Response.Flush();
Response.End();

Below link is used to export datatable to excel in C# Code.
http://royalarun.blogspot.in/2012/01/export-datatable-to-excel-in-c-windows.html
using System;
using System.Data;
using System.IO;
using System.Windows.Forms;
namespace ExportExcel
{
public partial class ExportDatatabletoExcel : Form
{
public ExportDatatabletoExcel()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
//Add Datacolumn
DataColumn workCol = dt.Columns.Add("FirstName", typeof(String));
dt.Columns.Add("LastName", typeof(String));
dt.Columns.Add("Blog", typeof(String));
dt.Columns.Add("City", typeof(String));
dt.Columns.Add("Country", typeof(String));
//Add in the datarow
DataRow newRow = dt.NewRow();
newRow["firstname"] = "Arun";
newRow["lastname"] = "Prakash";
newRow["Blog"] = "http://royalarun.blogspot.com/";
newRow["city"] = "Coimbatore";
newRow["country"] = "India";
dt.Rows.Add(newRow);
//open file
StreamWriter wr = new StreamWriter(#"D:\\Book1.xls");
try
{
for (int i = 0; i < dt.Columns.Count; i++)
{
wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
}
wr.WriteLine();
//write rows to excel file
for (int i = 0; i < (dt.Rows.Count); i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
if (dt.Rows[i][j] != null)
{
wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
}
else
{
wr.Write("\t");
}
}
//go to next line
wr.WriteLine();
}
//close file
wr.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
}

The most rank answer in this post work, however its is CSV file. It is not actual Excel file. Therefore, you will get a warning when you are opening a file.
The best solution I found on the web is using CloseXML
https://github.com/closedxml/closedxml
You need to Open XML as well.
dt = city.GetAllCity();//your datatable
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GridView.xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
Credit: http://www.aspsnippets.com/Articles/Solution-ASPNet-GridView-Export-to-Excel-The-file-you-are-trying-to-open-is-in-a-different-format-than-specified-by-the-file-extension.aspx

I use This in page.`
public void DTToExcel(DataTable dt)
{
// dosya isimleri ileride aynı anda birden fazla kullanıcı aynı dosya üzerinde işlem yapmak ister düşüncesiyle guid yapıldı.
string FileName = Guid.NewGuid().ToString();
FileInfo f = new FileInfo(Server.MapPath("Downloads") + string.Format("\\{0}.xlsx", FileName));
if (f.Exists)
f.Delete(); // delete the file if it already exist.
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearHeaders();
response.ClearContent();
response.Charset = Encoding.UTF8.WebName;
response.AddHeader("content-disposition", "attachment; filename=" + FileName + ".xls");
response.AddHeader("Content-Type", "application/Excel");
response.ContentType = "application/vnd.xlsx";
//response.AddHeader("Content-Length", file.Length.ToString());
// create a string writer
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw)) //datatable'a aldığımız sorguyu bir datagrid'e atayıp html'e çevir.
{
// instantiate a datagrid
DataGrid dg = new DataGrid();
dg.DataSource = dt;
dg.DataBind();
dg.RenderControl(htw);
response.Write(sw.ToString());
dg.Dispose();
dt.Dispose();
response.End();
}
}
}

var lines = new List<string>();
string[] columnNames = dt.Columns.Cast<DataColumn>().
Select(column => column.ColumnName).
ToArray();
var header = string.Join(",", columnNames);
lines.Add(header);
var valueLines = dt.AsEnumerable()
.Select(row => string.Join(",", row.ItemArray));
lines.AddRange(valueLines);
File.WriteAllLines("excel.csv", lines);
Here dt refers to your DataTable pass as a paramter

While not a .NET implementation, you may find that the plug-in TableTools may be highly effective depending on your audience. It relies upon flash which shouldn't be a problem for most cases of needing to actually work in-depth and then want to record tabular information.
The latest version appears to support copying to clipboard, into a CSV, ".XLS" (really just a tab-delimited file named .xls), to a PDF, or create a printer friendly page version with all rows displayed and the rest of your page's contents hidden.
I found the extension on the DataTables site here: http://datatables.net/extras/tabletools/
The download is available in the plug-ins (extras) page here: http://datatables.net/extras/
It supposedly is downloaded as a part of DataTables (hence the phrase "Extras included in the DataTables package") but I didn't find it in the download I have been using. Seems to work wonderfully!

Most answers are actually producing the CSV which I don't always have good experience with, when opening in Excel.
One way of doing it would be also with ACE OLEDB Provider (see also connection strings for Excel). Of course you'd have to have the provider installed and registered. You do have it, if you have Excel installed, but this is something you have to consider when deploying (e.g. on web server).
In below helper class code you'd have to call something like ExportHelper.CreateXlsFromDataTable(dataset.Tables[0], #"C:\tmp\export.xls");
public class ExportHelper
{
private const string ExcelOleDbConnectionStringTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES\";";
/// <summary>
/// Creates the Excel file from items in DataTable and writes them to specified output file.
/// </summary>
public static void CreateXlsFromDataTable(DataTable dataTable, string fullFilePath)
{
string createTableWithHeaderScript = GenerateCreateTableCommand(dataTable);
using (var conn = new OleDbConnection(String.Format(ExcelOleDbConnectionStringTemplate, fullFilePath)))
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
OleDbCommand cmd = new OleDbCommand(createTableWithHeaderScript, conn);
cmd.ExecuteNonQuery();
foreach (DataRow dataExportRow in dataTable.Rows)
{
AddNewRow(conn, dataExportRow);
}
}
}
private static void AddNewRow(OleDbConnection conn, DataRow dataRow)
{
string insertCmd = GenerateInsertRowCommand(dataRow);
using (OleDbCommand cmd = new OleDbCommand(insertCmd, conn))
{
AddParametersWithValue(cmd, dataRow);
cmd.ExecuteNonQuery();
}
}
/// <summary>
/// Generates the insert row command.
/// </summary>
private static string GenerateInsertRowCommand(DataRow dataRow)
{
var stringBuilder = new StringBuilder();
var columns = dataRow.Table.Columns.Cast<DataColumn>().ToList();
var columnNamesCommaSeparated = string.Join(",", columns.Select(x => x.Caption));
var questionmarkCommaSeparated = string.Join(",", columns.Select(x => "?"));
stringBuilder.AppendFormat("INSERT INTO [{0}] (", dataRow.Table.TableName);
stringBuilder.Append(columnNamesCommaSeparated);
stringBuilder.Append(") VALUES(");
stringBuilder.Append(questionmarkCommaSeparated);
stringBuilder.Append(")");
return stringBuilder.ToString();
}
/// <summary>
/// Adds the parameters with value.
/// </summary>
private static void AddParametersWithValue(OleDbCommand cmd, DataRow dataRow)
{
var paramNumber = 1;
for (int i = 0; i <= dataRow.Table.Columns.Count - 1; i++)
{
if (!ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(int)) && !ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(decimal)))
{
cmd.Parameters.AddWithValue("#p" + paramNumber, dataRow[i].ToString().Replace("'", "''"));
}
else
{
object value = GetParameterValue(dataRow[i]);
OleDbParameter parameter = cmd.Parameters.AddWithValue("#p" + paramNumber, value);
if (value is decimal)
{
parameter.OleDbType = OleDbType.Currency;
}
}
paramNumber = paramNumber + 1;
}
}
/// <summary>
/// Gets the formatted value for the OleDbParameter.
/// </summary>
private static object GetParameterValue(object value)
{
if (value is string)
{
return value.ToString().Replace("'", "''");
}
return value;
}
private static string GenerateCreateTableCommand(DataTable tableDefination)
{
StringBuilder stringBuilder = new StringBuilder();
bool firstcol = true;
stringBuilder.AppendFormat("CREATE TABLE [{0}] (", tableDefination.TableName);
foreach (DataColumn tableColumn in tableDefination.Columns)
{
if (!firstcol)
{
stringBuilder.Append(", ");
}
firstcol = false;
string columnDataType = "CHAR(255)";
switch (tableColumn.DataType.Name)
{
case "String":
columnDataType = "CHAR(255)";
break;
case "Int32":
columnDataType = "INTEGER";
break;
case "Decimal":
// Use currency instead of decimal because of bug described at
// http://social.msdn.microsoft.com/Forums/vstudio/en-US/5d6248a5-ef00-4f46-be9d-853207656bcc/localization-trouble-with-oledbparameter-and-decimal?forum=csharpgeneral
columnDataType = "CURRENCY";
break;
}
stringBuilder.AppendFormat("{0} {1}", tableColumn.ColumnName, columnDataType);
}
stringBuilder.Append(")");
return stringBuilder.ToString();
}
}

Working code for Excel Export
try
{
DataTable dt = DS.Tables[0];
string attachment = "attachment; filename=log.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
}
catch (Exception Ex)
{ }

Try this to export the data to Excel file same as in DataTable and could customize also.
dtDataTable1 = ds.Tables[0];
try
{
Microsoft.Office.Interop.Excel.Application ExcelApp = new Microsoft.Office.Interop.Excel.Application();
Workbook xlWorkBook = ExcelApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
for (int i = 1; i > 0; i--)
{
Sheets xlSheets = null;
Worksheet xlWorksheet = null;
//Create Excel sheet
xlSheets = ExcelApp.Sheets;
xlWorksheet = (Worksheet)xlSheets.Add(xlSheets[1], Type.Missing, Type.Missing, Type.Missing);
xlWorksheet.Name = "MY FIRST EXCEL FILE";
for (int j = 1; j < dtDataTable1.Columns.Count + 1; j++)
{
ExcelApp.Cells[i, j] = dtDataTable1.Columns[j - 1].ColumnName;
ExcelApp.Cells[1, j].Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Green);
ExcelApp.Cells[i, j].Font.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.WhiteSmoke);
}
// for the data of the excel
for (int k = 0; k < dtDataTable1.Rows.Count; k++)
{
for (int l = 0; l < dtDataTable1.Columns.Count; l++)
{
ExcelApp.Cells[k + 2, l + 1] = dtDataTable1.Rows[k].ItemArray[l].ToString();
}
}
ExcelApp.Columns.AutoFit();
}
((Worksheet)ExcelApp.ActiveWorkbook.Sheets[ExcelApp.ActiveWorkbook.Sheets.Count]).Delete();
ExcelApp.Visible = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

If you to export datatable to excel with formatted header text try like this.
public void ExportFullDetails()
{
Int16 id = Convert.ToInt16(Session["id"]);
DataTable registeredpeople = new DataTable();
registeredpeople = this.dataAccess.ExportDetails(eventid);
string attachment = "attachment; filename=Details.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
registeredpeople.Columns["Reg_id"].ColumnName = "Reg. ID";
registeredpeople.Columns["Name"].ColumnName = "Name";
registeredpeople.Columns["Reg_country"].ColumnName = "Country";
registeredpeople.Columns["Reg_city"].ColumnName = "City";
registeredpeople.Columns["Reg_email"].ColumnName = "Email";
registeredpeople.Columns["Reg_business_phone"].ColumnName = "Business Phone";
registeredpeople.Columns["Reg_mobile"].ColumnName = "Mobile";
registeredpeople.Columns["PositionRole"].ColumnName = "Position";
registeredpeople.Columns["Reg_work_type"].ColumnName = "Work Type";
foreach (DataColumn dc in registeredpeople.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in registeredpeople.Rows)
{
tab = "";
for (i = 0; i < registeredpeople.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
}

I have done the DataTable to Excel conversion with the following code. Hope it's very easy no need to change more just copy & pest the code replace your variable with your variable, and it will work properly.
First create a folder in your solution Document, and create an Excel file MyTemplate.xlsx. you can change those name according to your requirement. But remember for that you have to change the name in code also.
Please find the following code...
protected void GetExcel_Click(object sender, EventArgs e)
{
ManageTicketBS objManageTicket = new ManageTicketBS();
DataTable DT = objManageTicket.GetAlldataByDate(); //this function will bring the data in DataTable format, you can use your function instate of that.
string DownloadFileName;
string FolderPath;
string FileName = "MyTemplate.xlsx";
DownloadFileName = Path.GetFileNameWithoutExtension(FileName) + new Random().Next(10000, 99999) + Path.GetExtension(FileName);
FolderPath = ".\\" + DownloadFileName;
GetParents(Server.MapPath("~/Document/" + FileName), Server.MapPath("~/Document/" + DownloadFileName), DT);
string path = Server.MapPath("~/Document/" + FolderPath);
FileInfo file = new FileInfo(path);
if (file.Exists)
{
try
{
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearContent();
response.ClearHeaders();
response.Buffer = true;
response.ContentType = MimeType(Path.GetExtension(FolderPath));
response.AddHeader("Content-Disposition", "attachment;filename=" + DownloadFileName);
byte[] data = File.ReadAllBytes(path);
response.BinaryWrite(data);
HttpContext.Current.ApplicationInstance.CompleteRequest();
response.End();
}
catch (Exception ex)
{
ex.ToString();
}
finally
{
DeleteOrganisationtoSupplierTemplate(path);
}
}
}
public string GetParents(string FilePath, string TempFilePath, DataTable DTTBL)
{
File.Copy(Path.Combine(FilePath), Path.Combine(TempFilePath), true);
FileInfo file = new FileInfo(TempFilePath);
try
{
DatatableToExcel(DTTBL, TempFilePath, 0);
return TempFilePath;
}
catch (Exception ex)
{
return "";
}
}
public static string MimeType(string Extension)
{
string mime = "application/octetstream";
if (string.IsNullOrEmpty(Extension))
return mime;
string ext = Extension.ToLower();
Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
if (rk != null && rk.GetValue("Content Type") != null)
mime = rk.GetValue("Content Type").ToString();
return mime;
}
static bool DeleteOrganisationtoSupplierTemplate(string filePath)
{
try
{
File.Delete(filePath);
return true;
}
catch (IOException)
{
return false;
}
}
public void DatatableToExcel(DataTable dtable, string pFilePath, int excelSheetIndex=1)
{
try
{
if (dtable != null && dtable.Rows.Count > 0)
{
IWorkbook workbook = null;
ISheet worksheet = null;
using (FileStream stream = new FileStream(pFilePath, FileMode.Open, FileAccess.ReadWrite))
{
workbook = WorkbookFactory.Create(stream);
worksheet = workbook.GetSheetAt(excelSheetIndex);
int iRow = 1;
foreach (DataRow row in dtable.Rows)
{
IRow file = worksheet.CreateRow(iRow);
int iCol = 0;
foreach (DataColumn column in dtable.Columns)
{
ICell cell = null;
object cellValue = row[iCol];
switch (column.DataType.ToString())
{
case "System.Boolean":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Boolean);
if (Convert.ToBoolean(cellValue)) { cell.SetCellFormula("TRUE()"); }
else { cell.SetCellFormula("FALSE()"); }
//cell.CellStyle = _boolCellStyle;
}
break;
case "System.String":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.String);
cell.SetCellValue(Convert.ToString(cellValue));
}
break;
case "System.Int32":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToInt32(cellValue));
//cell.CellStyle = _intCellStyle;
}
break;
case "System.Int64":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToInt64(cellValue));
//cell.CellStyle = _intCellStyle;
}
break;
case "System.Decimal":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToDouble(cellValue));
//cell.CellStyle = _doubleCellStyle;
}
break;
case "System.Double":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.Numeric);
cell.SetCellValue(Convert.ToDouble(cellValue));
//cell.CellStyle = _doubleCellStyle;
}
break;
case "System.DateTime":
if (cellValue != DBNull.Value)
{
cell = file.CreateCell(iCol, CellType.String);
DateTime dateTime = Convert.ToDateTime(cellValue);
cell.SetCellValue(dateTime.ToString("dd/MM/yyyy"));
DateTime cDate = Convert.ToDateTime(cellValue);
if (cDate != null && cDate.Hour > 0)
{
//cell.CellStyle = _dateTimeCellStyle;
}
else
{
// cell.CellStyle = _dateCellStyle;
}
}
break;
default:
break;
}
iCol++;
}
iRow++;
}
using (var WritetoExcelfile = new FileStream(pFilePath, FileMode.Create, FileAccess.ReadWrite))
{
workbook.Write(WritetoExcelfile);
WritetoExcelfile.Close();
//workbook.Write(stream);
stream.Close();
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
This code you just need to copy & pest in your script and add the Namespace as following, Also change the excel file name as previously discussed.
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.SS.Util;

Please try this, this will export your data table data's faster to excel.
Note: Range "FW", that I have hard coded is because I had 179 columns.
public void UpdateExcelApplication(SqlDataTable dataTable)
{
var objects = new string[dataTable.Rows.Count, dataTable.Columns.Count];
var rowIndex = 0;
foreach (DataRow row in dataTable.Rows)
{
var colIndex = 0;
foreach (DataColumn column in dataTable.Columns)
{
objects[rowIndex, colIndex++] = Convert.ToString(row[column]);
}
rowIndex++;
}
var range = this.workSheet.Range[$"A3:FW{dataTable.Rows.Count + 2}"];
range.Value = objects;
this.workSheet.Columns.AutoFit();
this.workSheet.Rows.AutoFit();
}

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Exporting DataTable to Excel - c#

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