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Excel to DataGridView

Additional information: The Microsoft Office Access database engine could not find the object 'C:\Users\username\Documents\sampleData.xls'. Make sure the object exists and that you spell its name and the path name correctly.
The Error is highlighted at
theDataAdapter.Fill(spreadSheetData);
Here's the sample data I used (tried in .csv , .xls , .xlsx )
Name Age Status Children
Johnny 34 Married 3
Joey 21 Single 1
Michael 16 Dating 0
Smith 42 Divorced 4
Here's the code associated:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
namespace uploadExcelFile
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnImport_Click(object sender, EventArgs e)
{
var frmDialog = new System.Windows.Forms.OpenFileDialog();
if (frmDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string strFileName = frmDialog.FileName;
System.IO.FileInfo spreadSheetFile = new System.IO.FileInfo(strFileName);
scheduleGridView.DataSource = spreadSheetFile.ToString();
System.Diagnostics.Debug.WriteLine(frmDialog.FileName);
System.Diagnostics.Debug.WriteLine(frmDialog.SafeFileName);
String name = frmDialog.SafeFileName;
String constr = String.Format(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES""", frmDialog.FileName);
OleDbConnection myConnection = new OleDbConnection(constr);
OleDbCommand onlineConnection = new OleDbCommand("SELECT * FROM [" + frmDialog.FileName + "]", myConnection);
myConnection.Open();
OleDbDataAdapter theDataAdapter = new OleDbDataAdapter(onlineConnection);
DataTable spreadSheetData = myConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
theDataAdapter.Fill(spreadSheetData);
scheduleGridView.DataSource = spreadSheetData;
}
}
}
}
scheduleGridView is the DataGridViews name, & btnImport is the name for the import Button.
I've installed 2007 Office System Driver: Data Connectivity Components; which gave me the AccessDatabaseEngine.exe, but from there I've been stuck here without understanding how to get around this. It should go without saying that the filepath is correct in its entirety. There is no odd characters in the path name either (spaces, underlines, etc)
Mini Update :: (another dead end it seems like)
Although the initial error says, "could not find the object 'C:\Users\username\Documents\sampleData.xls'"
In the Debugger the exception is read as
When I look at details the exception as "C:\Users\username\Documents\sampleData.xls"
So I thought the error was that it wasn't taking the path as a literal, but this article C# verbatim string literal not working. Very Strange backslash always double
Shows very clearly that that is not my issue.

I am guessing you may be mistaken by what is returned from the following line of code…
DataTable spreadSheetData = myConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
The DataTable returned from this line will have nine (9) columns (TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, TABLE_TYPE, TABLE_GUID, DESCRIPTION, TABLE_PROPID, DATE_CREATED and DATE_MODIFIED). This ONE (1) DataTable returned simply “Describes” the worksheet(s) and named range(s) in the entire selected Excel workbook. Each row in this DataTable represent either a worksheet OR a named range. To distinguish worksheets from named ranges, the “TABLE_NAME” column in this DataTable has the name of the worksheet or range AND ends each “Worksheet” Name with a dollar sign ($). If the “TABLE_NAME” value in a row does NOT end in dollar sign, then it is a range and not a worksheet.
Therefore, when the line
OleDbDataAdapter theDataAdapter = new OleDbDataAdapter(onlineConnection);
Blows up and says it cannot file the “filename” error… is somewhat expected because this line is looking for a “worksheet” name, not a filename. On the line creating the select command…
OleDbCommand onlineConnection = new OleDbCommand("SELECT * FROM [" + frmDialog.FileName + "]", myConnection);
This is incorrect; you have already selected the filename and open the file with
String constr = String.Format(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES""", frmDialog.FileName);
OleDbConnection myConnection = new OleDbConnection(constr);
myConnection.Open();
The correct OleDbCommand line should be…
OleDbCommand onlineConnection = new OleDbCommand("SELECT * FROM [" + sheetName + "]", myConnection);
The problem here is that the current code is not getting the worksheet names. Therefore, we cannot “select” the worksheet from the workbook then fill the adapter with the worksheet.
The other issue is setting the DataGridView’s DataSource to spreadSheetData… when you get the worksheet(s) from an Excel “Workbook”, you must assume there will be more than one sheet. Therefore a DataSet will work as a container to hold all the worksheets in the workbook. Each DataTable in the DataSet would be a single worksheet and it can be surmised that the DataGridView can only display ONE (1) of these tables at a time. Given this, below are the changes described along with an added button to display the “Next” worksheet in the DataGridView since there may be more than one worksheet in the workbook. Hope this makes sense.
int sheetIndex = 0;
DataSet ds = new DataSet();
public Form1() {
InitializeComponent();
}
private void btnImport_Click(object sender, EventArgs e) {
var frmDialog = new System.Windows.Forms.OpenFileDialog();
if (frmDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
String constr = String.Format(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES""", frmDialog.FileName);
OleDbConnection myConnection = new OleDbConnection(constr);
myConnection.Open();
DataTable spreadSheetData = myConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string sheetName = "";
DataTable dt;
OleDbCommand onlineConnection;
OleDbDataAdapter theDataAdapter;
// fill the "DataSet" each table in the set is a worksheet in the Excel file
foreach (DataRow dr in spreadSheetData.Rows) {
sheetName = dr["TABLE_NAME"].ToString();
sheetName = sheetName.Replace("'", "");
if (sheetName.EndsWith("$")) {
onlineConnection = new OleDbCommand("SELECT * FROM [" + sheetName + "]", myConnection);
theDataAdapter = new OleDbDataAdapter(onlineConnection);
dt = new DataTable();
dt.TableName = sheetName;
theDataAdapter.Fill(dt);
ds.Tables.Add(dt);
}
}
myConnection.Close();
scheduleGridView.DataSource = ds.Tables[0];
setLabel();
}
}
private void setLabel() {
label1.Text = "Showing worksheet " + sheetIndex + " Named: " + ds.Tables[sheetIndex].TableName + " out of a total of " + ds.Tables.Count + " worksheets";
}
private void btnNextSheet_Click(object sender, EventArgs e) {
if (sheetIndex == ds.Tables.Count - 1)
sheetIndex = 0;
else
sheetIndex++;
scheduleGridView.DataSource = ds.Tables[sheetIndex];
setLabel();
}

I solved it. Well there was a workaround. I used the Excel Data Reader found in this thread: How to Convert DataSet to DataTable
Which led me to https://github.com/ExcelDataReader/ExcelDataReader
^ The readme was fantastic, just went to solution explorer, right click on references, manage NuGet Packages, select browse in the new box, enter ExcelDataReader, then in the .cs file be sure to include, "using Excel;" at the top, the code mentioned in the first link was essentially enough, but here's my exact code for those wondering.
var frmDialog = new System.Windows.Forms.OpenFileDialog();
if (frmDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
/*string strFileName = frmDialog.FileName;
//System.IO.FileInfo spreadSheetFile = new System.IO.FileInfo(strFileName);
System.IO.StreamReader reader = new System.IO.StreamReader(strFileName);
*/
string strFileName = frmDialog.FileName;
FileStream stream = File.Open(strFileName, FileMode.Open, FileAccess.Read);
//1. Reading from a binary Excel file ('97-2003 format; *.xls)
IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
//...
//2. Reading from a OpenXml Excel file (2007 format; *.xlsx)
//IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
//...
//3. DataSet - The result of each spreadsheet will be created in the result.Tables
//DataSet result = excelReader.AsDataSet();
//...
//4. DataSet - Create column names from first row
excelReader.IsFirstRowAsColumnNames = true;
DataSet result = excelReader.AsDataSet();
DataTable data = result.Tables[0];
//5. Data Reader methods
while (excelReader.Read())
{
//excelReader.GetInt32(0);
}
scheduleGridView.DataSource = data;
excelReader.Close();

How can I get A1 cell from a 97/03 Excel document with OleDB?

I've got a Excel 97/03 document that has "blabla" in its A1 cell in sheet "Sheet1". I thought the following should be able to extract it:
string con = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Book1.xls;" + #"Extended Properties='Excel 8.0;HDR=Yes;'";
using (OleDbConnection connection = new OleDbConnection(con))
{
connection.Open();
OleDbDataAdapter da = new OleDbDataAdapter("Select * From [Sheet1$]", connection);
DataTable dt = new DataTable();
da.Fill(dt);
dynamic cellA1 = dt.Rows[0][0].ToString();
But cellA1 is empty (""). Anyone know how to fix this, I should be able to treat it as a database and get cells from it?

"HDR=Yes;" indicates that the first row contains columnnames, not data. "HDR=No;" indicates the opposite. maybe thats the issue.

The datatable is using the first row of data as its headers, to access the A1 cell simply use the name of the first column:
dynamic cellA1 = dt.Columns[0].ToString();

Loop through excel file in c#

I have a problem with looping through an excel file.
I want to be able to create an automatic code that will handle multiple excel files
There is a fix header in each file, so the "real" datas begin at line 15.
I'm trying to use "usedRange" but I don't really understand the doc.
Actually, I have this :
var excel = new Excel.Application();
var wkb = OpenBook(excel, _myExcelFile, true, false, false);
var sheet = wkb.Sheets["B.C"] as Excel.Worksheet;
var usedRange = sheet.UsedRange;
var i = 0;
foreach (Excel.Range row in sheet.UsedRange.Rows)
{
i++;
// I get data like this (for column 2 for example) :
// Convert.ToString(row.Cells[i, 2].Value);
}
Problem is that my excel file have over 3000+ rows, but the loop returns only 1800+, I can't figure why.
I think that there is a problem with the "UsedRange" function but don't know why.
How can I loop ALL rows in my file?

Another option is to turn your excel into a datatable - following is untested (I don't have excel on this PC)
System.Data.OleDb.OleDbConnection MyConnection;
System.Data.DataTable DtSet;
System.Data.OleDb.OleDbDataAdapter MyCommand;
MyConnection = new System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='c:\\csharp.net-informations.xls';Extended Properties=Excel 8.0;");
MyCommand = new System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection);
MyCommand.TableMappings.Add("Table", "TestTable");
DtSet = new System.Data.DataTable();
MyCommand.Fill(DtSet);
MyConnection.Close();
You can then do linq on it with things like
var x = DTset.AsEnumberable().Where( r => r["My Field"].ToString() == "Pick me");
or just use it like a normal datatable

How to access Excel data in C#

I am trying to access data from Excel in C#. Ideally I want to put the data into a list or a series collection. I was using this tutorial - http://www.aspsnippets.com/Articles/Read-Excel-file-using-OLEDB-Data-Provider-in-C-Net.aspx.
It was very helpful but I think he missed out the data adapter part. Here is the code I got following his example.
string connectionString = null;
connectionString = "Provider = Microsoft.ACE.OLEDB.12.0; Data Source = P:\\Visual Studio 2012\\Projects\\SmartSheetAPI\\SmartSheetAPI\\bin\\Debug\\OUTPUT.xls; Extended Properties = 'excel 12.0 Xml; HDR=YES; IMEX=1;';";
//Establish Connection
string dataSource = "P:\\Visual Studio 2012\\Projects\\SmartSheetAPI\\SmartSheetAPI\\bin\\Debug\\OUTPUT.xls;";
string excelConnection = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source = " + dataSource + " Extended Properties='Excel 8.0; HDR=Yes'";
OleDbConnection connExcel = new OleDbConnection(connectionString);
OleDbCommand cmdExcel = new OleDbCommand();
cmdExcel.Connection = connExcel;
//Accessing Sheets
connExcel.Open();
DataTable dtExcelSchema;
dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
connExcel.Close();
//access excel Sheets (tables in database)
DataSet dataset = new DataSet();
string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
cmdExcel.CommandText = "SELECT * From [" + SheetName + "]";
da.SelectCommand = cmdExcel;
da.Fill(dataset);
connExcel.Close();
If you look at the bottom three lines you will notice he uses da.SelectCommand and da.Fill to fill the dataset. But I think this requires a dataadapter and he doesn't have that in his example. I have tried creating a dataadapter as below:
SqlDataAdapter dataadapter = new SqlDataAdapter();
But I get an error stating: cannot implicitly convert type 'System.Data.OleDb.OleDbCommand' to System.Data.SqlClient.SqlCommand'.
I know it is working right up to the select statement. Can someone help me I basically just want to be able to access the information I am getting in the select statement.

Accessing excel data using Oledb connection is always a headache.You can try third party controls instead, like Aspose.Usage is very simple .You can try the following code after adding the control's reference to your project.
//Creating a file stream containing the Excel file to be opened
FileStream fstream = new FileStream("C:\\book1.xls", FileMode.Open);
//Instantiating a Workbook object
//Opening the Excel file through the file stream
Workbook workbook = new Workbook(fstream);
//Accessing the first worksheet in the Excel file
Worksheet worksheet = workbook.Worksheets[0];
//Exporting the contents of 7 rows and 2 columns starting from 1st cell to DataTable
DataTable dataTable = worksheet.Cells.ExportDataTable(0, 0, 7, 2, true);
//Binding the DataTable with DataGrid
dataGrid1.DataSource = dataTable;
//Closing the file stream to free all resources
fstream.Close();

You need an OleDBDataAdapter, not SqlDataAdapter. So, do this:
OleDBDataAdapter da = new OleDBDataAdapter(cmdExcel);
da.Fill(dataset);
Excel is an OLEDB data source, and so the classes you should be using will be prefixed with OleDb in general, just like the ones for database connectivity and manipulation are prefixed with Sql.
Documentation

How to read excel (.xlsm) file, that file is using finansu add-in through C#

I have a excel (.xlsm) file with stock markets live data update through the excel add-in "finansu".
When I try to read excel data through the C# application in stock name column it shows the proper stock name but at the value column it does not show any thing. That stock value column is updated live values through the finansu add-in.
Please help me out to read these values as well.
Thanks in advance.
Below is the source code:
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=1\";";
query = "SELECT * FROM [RealTime$]";
conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed)
conn.Open();
cmd = new OleDbCommand(query, conn);
da = new OleDbDataAdapter(cmd);
dt = new System.Data.DataTable();
da.Fill(dt);

OLEDB won't be able to retrieve the data you want. I'm not familiar with the finansu add-in, but Excel Interop should be able to get what you need.
Microsoft.Office.Interop.Excel
Sample code:
using Microsoft.Office.Interop.Excel;
using System;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
var filename = #"C:\temp\Book1.xlsx";
var excel = new Microsoft.Office.Interop.Excel.Application();
var wb = excel.Workbooks.Open(filename);
Worksheet realtime = wb.Sheets["RealTime"];
foreach (Range row in realtime.UsedRange.Rows)
{
Console.WriteLine("{0}", row.Cells[1, 1].Value); // Column A
Console.WriteLine("{0}", row.Cells[1, 2].Value); // Column B
// etc ...
}
wb.Close(SaveChanges: false);
}
}
}