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try
    {
        DataTable dt = new DataTable();
        objDB = new DatabaseToExcel.DB(ConnectionString);
        dt = objDB.runQuery(query);
        ctl_progress.Visible = true;
        ctl_progress.Minimum = 1;
        ctl_progress.Maximum = dt.Rows.Count + 1;
        ctl_progress.Value = 1;
        //This is to access the first work sheet of your application
        sheet = (Excel.Worksheet)book.Worksheets[1];
        sheet.Name = "SampleExcel";
        for(int i = 1 ; i <= dt.Rows.Count ; i++)
        {
            for(int j = 1 ; j <= dt.Columns.Count ; j++ )
            {
                // This is to add the Data which retrieved from
                // the database into your Excel Sheet.
                ((Excel.Range)sheet.Cells[i,j]).Value2
                                   = dt.Rows[i-1].ItemArray[j-1].ToString();
                //dt.Rows[i-1].ItemArray[j-1].ToString()--> This will retrieve
                // data from your datatable's
                //(i-1)th rows (j-1)st column
            }
            ctl_progress.Value += 1;
        }
        MessageBox.Show("Your Process Completed Successfully");
        ctl_progress.Visible = false;
    }
    catch(Exception e1)
    {
        MessageBox.Show(e1.Message);
    }