Question

I have two Gridview in my Web application.I need ,while clicking the (ExcelExpot) button the values to be Export in Excel Accordingly Sheet1 and Sheet2.

  protected void ExportToExcel()
    {

        this.GridView1.EditIndex = -1;
        Response.Clear();
        Response.Buffer = true;
        string connectionString = (string)ConfigurationSettings.AppSettings["ConnectionString"];
        SqlConnection sqlconnection = new SqlConnection(connectionString);
        String sqlSelect = "select * from login";
        sqlconnection.Open();
        SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(sqlSelect, connectionString);
        //DataTable dt1
        DataTable dt1 =new DataTable();
        mySqlDataAdapter.Fill(dt1);

        //LinQ Query for dt2
        var query = (from c in dt.AsEnumerable()
        select new {id= c.Field<string>("id"),name=c.Field<string>("name"),city=c.Field<string>("city")}) ;
        DataTable dt2 = new DataTable();
        d2=query.CopyToDatatable();

        DataSet ds=new DataSet();
        ds.Tabls.Add(dt1);
        ds.Tabls.Add(dt2);
        Excel.Application excelHandle1 = PrepareForExport(ds);
        excelHandle1.Visible = true;

    } 
  // code for PrepareForExport(ds);
         PrepareForExport(ds)
             {

                two tables in two worksheets of Excel...

              }

Answer 1

I agree with @Andrew Burgess and have implemented his code into one of my projects. Just for the record theres a few small errors in the code which will cause some COM Exceptions. The corrected code is below (the issue was that Excel numbers sheets, rows, columns from 1 to n not from zero).

using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
using System.IO;

        //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();