Export to Excel from GridView in C#

Introduction This post shows that how you can export data from gridview to Excel and formatting Excel file in C#. Follow the below process:

1. Add reference below in your project:

   Microsoft Office 12.0 Control Library

2. Now, add NameSpace in your Page at which you want to use this functionality:

   using Microsoft.Office.Interop.Excel;

3. At click event of button (Export to Excel), call below function:

   private void ExportToExcel()
   {
   //First fetch all records from grid to dataset
   DataSet dset = new DataSet();
   dset.Tables.Add();
   //First Add Columns from gridview to excel
   for (int i = 0; i < gridView.Columns.Count; i++) //GridView is id of gridview
   {
   dset.Tables[0].Columns.Add(gridView.Columns[i].HeaderText);
   }
   //add rows to the table 
   System.Data.DataRow dr1;
   for (int i = 0; i < gridView.Rows.Count; i++)
   {
   dr1 = dset.Tables[0].NewRow(); //For Example There are only 3 columns into gridview
   System.Web.UI.WebControls.Label lblCCName = (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblCCName");
   System.Web.UI.WebControls.Label lblItemName = (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblItemName");
   System.Web.UI.WebControls.Label lblItemCode = (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblItemCode");
   dr1[0] = lblCCName.Text.ToString();
   dr1[1] = lblItemName.Text.ToString();
   dr1[2] = lblItemCode.Text.ToString(); 
   dset.Tables[0].Rows.Add(dr1); 
   }
   //below code is export dset to excel
   ApplicationClass excel = new ApplicationClass();
   Workbook wBook;
   Worksheet wSheet; 
   wBook = excel.Workbooks.Add(System.Reflection.Missing.Value);
   wSheet = (Worksheet)wBook.ActiveSheet;
   System.Data.DataTable dt = dset.Tables[0];
   System.Data.DataColumn dc = new DataColumn();
   int colIndex = 0;
   int rowIndex = 4;
   foreach (DataColumn dcol in dt.Columns)
   {
   colIndex = colIndex + 1;
   excel.Cells[5, colIndex] = dcol.ColumnName;
   }
   foreach (DataRow drow in dt.Rows) 
   {
   rowIndex = rowIndex + 1;
   colIndex = 0;
   foreach (DataColumn dcol in dt.Columns)
   {
   colIndex = colIndex + 1;
   excel.Cells[rowIndex + 1, colIndex] = drow[dcol.ColumnName];
   }
   }
   wSheet.Columns.AutoFit();
   String strFileName = Server.MapPath("~\\Images\\StockStatement.xls"); // Server File Path Where you want to save excel file.
   Boolean blnFileOpen = false;
   try
   {
   System.IO.FileStream fileTemp = File.OpenWrite(strFileName);
   fileTemp.Close();
   }
   catch
   {
   blnFileOpen = false;
   }
   if (System.IO.File.Exists(strFileName)) //It checks if file exists then it delete that file.
   {
   System.IO.File.Delete(strFileName);
   }  
   } 
   
   //For Saving excel file on Server
   wBook.SaveAs(strFileName, XlFileFormat.xlExcel12, System.Reflection.Missing.Value, System.Reflection.Missing.Value, false, false, XlSaveAsAccessMode.xlShared, XlSaveConflictResolution.xlLocalSessionChanges, false, System.Reflection.Missing.Value, System.Reflection.Missing.Value, false);

4. Before saving, you can format the Excel data using the below code:

   Range oRng;
   wSheet.Cells[1, 2] = lblOffice1.Text;
   wSheet.Cells[3, 2] = lblCostCenter1.Text;
   wSheet.Cells[4, 1] = lblOfficeName1.Text;
   wSheet.get_Range("B1", "B1").Font.Bold = true;
   wSheet.get_Range("B1", "B1").Font.ColorIndex = 55;
   wSheet.get_Range("B3", "B3").Font.ColorIndex = 55;
   wSheet.get_Range("A4", "A4").Font.ColorIndex = 55;
   wSheet.get_Range("B1", "E1").Merge(Type.Missing);
   wSheet.get_Range("B3", "E3").Merge(Type.Missing);
   wSheet.get_Range("B1", "B1").HorizontalAlignment = Constants.xlCenter;
   wSheet.get_Range("B3", "B3").HorizontalAlignment = Constants.xlCenter;
   wSheet.get_Range("B3", "B3").Font.Bold = true;
   wSheet.get_Range("A4", "A4").Font.Bold = true;
   wSheet.get_Range("A4", "A4").HorizontalAlignment = Constants.xlLeft;
   wSheet.get_Range("A5", "P5").Font.Bold = true;
   wSheet.get_Range("A5", "P5").Interior.ColorIndex = 43;
   wSheet.Name = "Stock Statement";
   
   //AutoFit columns
   oRng = wSheet.get_Range("A1", "P1"); 
   oRng.EntireColumn.AutoFit();

   You can use the above code for Export data to Excel using gridview in C#. It saves Excel file to server. You can use download code for save Excel file from server to client system.

Point of Interest Using this code, you will get proper Excel file and formatted. You can use formula on columns. Using there should be full permissions to IIS user and Network Service User. When you use the above code, then there can be some issue, then add below code in web.config file

<identity impersonate="true"/>

If anybody has any issues with this topic, send me comments. I will provide your solution.