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Export Datatable into Excel Strat from Specific Column C#

I have a datatable and I want export the data into excel but start exporting from a specific column. Scenario, I have an excel sheet and first 5 columns [A-E] have data and want to export from datatable and should start from column F.
How to achieve this in C# console application?

So, the most obvious approach here would be to iterate over the data table's rows and write each to the Excel sheet manually:
Microsoft.Office.Interop.Excel.Application oXL;
Microsoft.Office.Interop.Excel._Workbook oWB;
Microsoft.Office.Interop.Excel._Worksheet oSheet;
// Start Excel and get Application object.
oXL = new Microsoft.Office.Interop.Excel.Application();
oXL.Visible = true;
// Get a new workbook.
oWB = (Microsoft.Office.Interop.Excel._Workbook)(oXL.Workbooks.Add(""));
oSheet = (Microsoft.Office.Interop.Excel._Worksheet)oWB.ActiveSheet;
// Write the data. Remember that Excel is 1-indexed
int rowIndex = 1;
foreach (DataRow row in table.Rows) {
int colIndex = 6;
foreach (DataColumn col in table.Columns) {
oSheet.Cells[rowIndex, colIndex] = row[col];
colIndex++;
}
rowIndex++;
}
// Save the Excel file
oXL.Visible = false;
oXL.UserControl = false;
oWB.SaveAs("c:\\test\\test505.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookDefault, Type.Missing, Type.Missing,
false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
// Exit Excel
oWB.Close();
oXL.Quit();
There's probably a more elegant solution to this problem but I think this will get the job done, at least. As a reference, my Excel code was modified from this question, so you might be able to find a better match for your specific needs there.

Alternatively, you could try using the ClosedXML library:
XLWorkbook workbook = new XLWorkbook();
DataTable table = GetYourTable();
var sheet = workbook.Worksheets.Add(table);
var firstColumn = sheet.Column(1);
firstColumn.InsertColumnsBefore(5);
This code works by creating a new Excel worksheet from the datatable, getting a pointer to the first column in the worksheet and then inserting five columns (A - E) before it.

you can use ClosedXML library. example from my code
var wb = new XLWorkbook();
var ws = wb.Worksheets.Add("My Sheet 1");
ws.Cell("A8").Value = "Print by Admin:";
ws.Cell("B8").Value = $"{GetUserById(userId).name} - {GetUserById(userId).position_name}";
ws.Range("B8:C8").Merge();
var range = ws.Cell("B12").InsertTable(data);
range.Style.Border.TopBorder = XLBorderStyleValues.Thin;
range.Style.Border.LeftBorder = XLBorderStyleValues.Thin;
range.Style.Border.RightBorder = XLBorderStyleValues.Thin;
range.Style.Border.BottomBorder = XLBorderStyleValues.Thin;
ws.Row(12).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Row(12).Style.Font.Bold = true;
MemoryStream stream = (MemoryStream)GetStream(wb);
return File(stream.ToArray(), ""application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"", "yourfilename.xlsx");
here code for Getstream:
public Stream GetStream(XLWorkbook excelWorkbook)
{
Stream fs = new MemoryStream();
excelWorkbook.SaveAs(fs);
fs.Position = 0;
return fs;
}

Split a large Excel file into multiple, based on row count

I have a C# console application which needs a large Excel to be split into multiple Excel files based on the row count. The code below shows a source file with only 51 rows (including the header column rows) but the final source file will have 100,000+ rows.
The code is trying to skip the very first (header) row and then should copy from rows 2 through 11 and so on--I have the target files set to only 10 rows per file, to make developing faster.
Question So how do I copy rows 2 through 11 and subsequent 10 rows from the source Excel file and paste to multiple target Excel files so that the target files each will have 10 rows?
Here is the almost newly written code. It is loosely based on copying of specific range of excel cells from one worksheet to another worksheet and https://social.msdn.microsoft.com/Forums/vstudio/en-US/afd01976-63d0-4f96-9ba4-e3e2b6cf8d55/excel-with-c-how-to-specify-a-range-?forum=vsto
Now I am able to write 5 Excel files. But the first file has 9 rows (starting from row 2) while 2nd file has only 3 rows, starting with row 10, the 3rd has 13 rows starting, again, with row 10; the last two files have incrementally more rows, both starting with row 10.
So something wrong with my For Loop? Or the way I am selecting the ranges?
string startPath = System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);
string filePath_source = Path.Combine(startPath, #"Source_Files\Offers_Source_Temp.xlsx");
string filePath_copiedinto = Path.Combine(startPath, #"Source_Files\ToBeCopiedInto.xlsx");
app = new Excel.Application();
app.DisplayAlerts = false;
book = app.Workbooks.Open(filePath_source);
sheet = (Excel.Worksheet)book.Worksheets.get_Item((1));
int iRowCount = sheet.UsedRange.Rows.Count;
int maxrows = 10;//change this to something like 50,000 later. 01/16/18
int maxloops = iRowCount / maxrows;
int beginrow = 2; //skipping the header row.
Excel.Application destxlApp;
Excel.Workbook destworkBook;
Excel.Worksheet destworkSheet;
Excel.Range destrange;
string srcPath;
string destPath;
//Opening of first worksheet and copying
srcPath = filePath_source;
for (int i = 1; i <= maxloops; i++) {
Excel.Range rng = (Excel.Range)sheet.Range[sheet.Cells[beginrow, 1], sheet.Cells[maxrows, 3]];
rng.Copy(Type.Missing);
//opening of the second worksheet and pasting
destPath = filePath_copiedinto;
destxlApp = new Excel.Application();
destxlApp.DisplayAlerts = false;
destworkBook = destxlApp.Workbooks.Open(destPath, 0, false);
destworkSheet = destworkBook.Worksheets.get_Item(1);
destrange = destworkSheet.Cells[1, 1];
destrange.Select();
destworkSheet.Paste(Type.Missing, Type.Missing);
destworkBook.SaveAs(startPath + "\\Output_Files\\" + beginrow + ".xlsx");
destworkBook.Close(true, null, null);
destxlApp.Quit();
beginrow = beginrow + maxrows;
string blah = null;
}

I would suggest to use OpenXml library to do that task. It is dependency free and supports the whole OpenXml structure.
Here a starting point how to read/write the rows:
using System;
using System.Linq;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
// Open the document for editing.
using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(fileName, false))
{
WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
WorksheetPart worksheetPart = workbookPart.WorksheetParts.First();
SheetData sheetData = worksheetPart.Worksheet.Elements<SheetData>().First();
foreach (Row r in sheetData.Elements<Row>())
{
}
}
Now, writing is very similar:
using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Create(fileName),
SpreadsheetDocumentType.Workbook))
{
// create the workbook
spreadSheet.AddWorkbookPart();
spreadSheet.WorkbookPart.Workbook = new Workbook (); // create the worksheet
spreadSheet.WorkbookPart.AddNewPart<WorksheetPart>();
spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet = new Worksheet();
// create sheet data
spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet.AppendChild(new SheetData());
// create row
spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet.First().AppendChild(new Row());
}

Got it! In my revised code in the Question, I came close but had some problem in the For Loop; fixed it per the code below. So here is the almost complete code. Thanks everyone for your help!!
try
{
string startPath = System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);
string filePath_source = Path.Combine(startPath, #"Source_Files\Offers_Source_Temp.xlsx");
string filePath_copiedinto = Path.Combine(startPath, #"Source_Files\ToBeCopiedInto.xlsx");
app = new Excel.Application();
app.DisplayAlerts = false;
book = app.Workbooks.Open(filePath_source);
sheet = (Excel.Worksheet)book.Worksheets.get_Item((1));
int iRowCount = sheet.UsedRange.Rows.Count;
int countColumns = sheet.UsedRange.Columns.Count;
int maxrows = 10;//change this to something like 50,000 later. 01/16/18
int maxloops = iRowCount / maxrows;
int beginrow = 2; //skipping the header row.
Excel.Application destxlApp;
Excel.Workbook destworkBook;
Excel.Worksheet destworkSheet;
Excel.Range destrange;
string srcPath;
string destPath;
//Opening of first worksheet and copying
srcPath = filePath_source;
for (int i = 1; i <= maxloops; i++) {
/// Excel.Range rng = (Excel.Range)sheet.Range[sheet.Cells[beginrow, 1], sheet.Cells[maxrows, 3]];
Excel.Range startCell = sheet.Cells[beginrow, 1];//not sure the second parameter needed?
Excel.Range endCell = sheet.Cells[beginrow+maxrows-1, 3];//not sure the second parameter needed?
Excel.Range rng = sheet.Range[startCell, endCell];
rng = rng.EntireRow;//so second parameters above should not be needed. But doesn't work without it!
rng.Copy(Type.Missing);
//opening of the second worksheet and pasting
destPath = filePath_copiedinto;
destxlApp = new Excel.Application();
destxlApp.DisplayAlerts = false;
destworkBook = destxlApp.Workbooks.Open(destPath, 0, false);
destworkSheet = destworkBook.Worksheets.get_Item(1);
destrange = destworkSheet.Cells[1, 1];
destrange.Select();
destworkSheet.Paste(Type.Missing, Type.Missing);
destworkBook.SaveAs(startPath + "\\Output_Files\\" + beginrow + ".xlsx");
destworkBook.Close(true, null, null);
destxlApp.Quit();
beginrow = beginrow + maxrows;
}//for loop
}

How to read cell values that are dynamically generated using macros in c#?

I have an excel file in which some cell values are generating dynamically using macro.
File is also read-only.
I have to read these dynamically generated values using c# code.
Use following macro code to generate cell values:
**Sub abc()
Range("E5").Value = "string"
Range("E6").Value = 2
End Sub**
Thank You...!

Check if you need to connect to already opened excel file.
If you use excelApp.Workbooks.Open, it is not reflecting sheet data updated by macros.
Instead, try BindToMoniker method as follows:
private void btnGetXLSValue_Click(object sender, EventArgs e)
{
object _row = 5;
object _column = 5;
Excel.Application excelApp = new Excel.Application();
excelApp.Visible = false;
excelApp.ScreenUpdating = false;
excelApp.DisplayAlerts = false;
Microsoft.Office.Interop.Excel.Workbook excelWorkbook ;//= excelApp.Workbooks.Open(#"C:\July.xlsm", 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);
//Get a reference to the Workbook object by using a file moniker.
//The xls was saved earlier with this file name.
excelWorkbook = (Excel.Workbook)System.Runtime.InteropServices.Marshal.BindToMoniker(#"C:\July.xlsm");
Microsoft.Office.Interop.Excel.Sheets excelSheets = excelWorkbook.Worksheets;
string currentSheet = "July 2015";
Microsoft.Office.Interop.Excel.Worksheet excelWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)excelSheets.get_Item(currentSheet);
Microsoft.Office.Interop.Excel.Range range = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.UsedRange;
string sValue = (range.Cells[_row, _column] as Microsoft.Office.Interop.Excel.Range).Value2.ToString();
//string sValue = (range.Cells[_row, _column] as Microsoft.Office.Interop.Excel.Range).get_Value(range).ToString();
MessageBox.Show(sValue);
}

How do I export 2 gridviews into 2 separate sheets in one MS Excel file?

How do I export 2 gridviews (GridView1 & GridView2) into 2 separate sheets in one MS Excel file with the click of 1 button? Currently, I'm able to export only 1 gridview to an Excel sheet which the filename is the same as the sheet name. But I would like to 2 gridviews into 2 separate sheets which I would like sheet name to be define/set by myself. Thanks
public void ExportGridToExcel()
{
Response.Clear();
Response.Buffer = true;
Response.ClearContent();
Response.ClearHeaders();
Response.Charset = "";
string FileName ="Export"+DateTime.Now+".xls";
StringWriter strwritter = new StringWriter();
HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition","attachment;filename=" + FileName);
GridView1.GridLines = GridLines.Both;
GridView1.HeaderStyle.Font.Bold = true;
GridView1.RenderControl(htmltextwrtter);
Response.Write(strwritter.ToString());
Response.End();
}

you need to modifiy your code so that you will create a worksheet in the excel file and manually copy the data from grid to excel file and create this code as a function that takes grid,sheetname and sheetid like 1 ,2 and so on as arguments and then within button click event call it twice once for grid1 and once for grid2 with different sheetnames and sheet ids 1 and 2 respectively. the code for the function is as follows.
Write these two line of code in button click event and after that call the function twice once for each grid by passing excel app and workbook also as arguments.
// creating Excel Application
Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
// creating new WorkBook within Excel application
Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);
public void ExportToExcel(Microsoft.Office.Interop.Excel._Application app, Microsoft.Office.Interop.Excel._Workbook workbook,GridView gridview,string SheetName,int sheetid)
{
// creating new Excelsheet in workbook
Microsoft.Office.Interop.Excel._Worksheet worksheet = null;
// see the excel sheet behind the program
app.Visible = true;
// get the reference of first sheet. By default its name is Sheet1.
// store its reference to worksheet
worksheet = workbook.Sheets["Sheet"+ sheetid];
worksheet = workbook.ActiveSheet;
// changing the name of active sheet
worksheet.Name = sheetname;
// storing header part in Excel
for(int i=1;i<gridview.Columns.Count+1;i++)
{
worksheet.Cells[1, i] = gridview.Columns[i-1].HeaderText;
}
// storing Each row and column value to excel sheet
for (int i=0; i < gridview.Rows.Count-1 ; i++)
{
for(int j=0;j<gridview.Columns.Count;j++)
{
worksheet.Cells[i + 2, j + 1] = gridview.Rows[i].Cells[j].Value.ToString();
}
}
// save the application
workbook.SaveAs("c:\\output.xls",Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive , Type.Missing, Type.Missing, Type.Missing, Type.Missing);
// Exit from the application
app.Quit();
}

//Edit my answer since there is only 1 export button:
Take a look at this question:
firstly add these namespace:
using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
using System.IO;
So basically you should have (or go ahead and make them) 2 DataTable (to bind to 2 gridviews): dt1 and dt2
Make a dataset and add 2 datatables to it
DataSet dataset = new DataSet();
dataset.Tables.Add(dt1);
dataset.Tables.Add(dt2);
then
//Print using Ofice InterOp
Excel.Application excel = new Excel.Application();
var workbook = (Excel._Workbook)(excel.Workbooks.Add(Missing.Value));
for (var i = 0; i < dataset.Tables.Count; i++)
{
if (workbook.Sheets.Count <= i)
{
workbook.Sheets.Add(Type.Missing, Type.Missing, Type.Missing,
Type.Missing);
}
//NOTE: Excel numbering goes from 1 to n
var currentSheet = (Excel._Worksheet)workbook.Sheets[i + 1];
for (var y = 0; y < dataset.Tables[i].Rows.Count; y++)
{
for (var x = 0; x < dataset.Tables[i].Rows[y].ItemArray.Count(); x++)
{
currentSheet.Cells[y+1, x+1] = dataset.Tables[i].Rows[y].ItemArray[x];
}
}
}
string outfile = #"C:\APP_OUTPUT\EXCEL_TEST.xlsx";
workbook.SaveAs( outfile, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing);
workbook.Close();
excel.Quit();
to change worksheet name, I believe you can do:
currentSheet.Name = "your sheet name"

creating excel sheet and writind data into it

I am working on writing the data into Excel sheet in c#.
I have wriiten the following code.
string excel_filename = #"C:\Users\Downloads\bookmain.xlsx";
Excel.Application excel = new Excel.Application();
excel.Visible = true;
Excel.Workbook wb = excel.Workbooks.Open(excel_filename);
Excel.Worksheet sh = wb.Sheets.Add();
sh.Name = "TestSheet";
sh.Cells[1, "A"].Value2 = "SNO";
sh.Cells[1, "B"].Value2 = "Name";
sh.Cells[1, "C"].Value2 = "ID";
for (int i = 0; i < 2; i++)
{
sh.Cells[i+2, "A"].Value2 = "1";
sh.Cells[i+2, "B"].Value2 = "A";
sh.Cells[i+2, "C"].Value2 = "1122";
}
wb.Save();
excel.Quit();
Here I have given the path of excel file that already exists and it is empty.
How to change this code that, when i give the path it should automatically check, if it exists it have to create otherwise no need to create.
Even my code also need to check sheet name, it it exist i shall directly edit it or else I need to create a new sheet.
Can any one share their response.
Thank you.

for checking existence of file :
if(!File.Exists(excel_filename))
{
//if not exists then only create:-
}
and for checking worksheet you can do like :
foreach (Sheet sheet in workbook.Sheets)
{
if (sheet.Name.equals("Test"))
{
//do something
}
}
UPDATED :
this is how it works :
Create Excel object
Excel.Application excel = new Excel.Application();
make Excel visible
excel.visible = true
add a worksheet
Excel.Worksheet sh = wb.Sheets.Add();
save it as
wb .SaveAs( #"C:\Users\Downloads\bookmain.xlsx",
Excel.XlFileFormat.xlXMLSpreadsheet, missing, missing,
false, false, Excel.XlSaveAsAccessMode.xlNoChange,
missing, missing, missing, missing, missing);