Question

Does someone know how I can export a gridview in ASP.net to Excel??

I use this code but I can’t access my gridview because it’s null

protected void BtnExport_Click(object sender, EventArgs e)
{
    DataTable dtOriginal = new DataTable();
    dtOriginal = (DataTable)gvRapporten.DataSource; //Return Table consisting data

    //Create Tempory Table
    DataTable dtTemp = new DataTable();

    //Creating Header Row
    dtTemp.Columns.Add("<b>Melder</b>");
    dtTemp.Columns.Add("<b>Onderwerp</b>");
    dtTemp.Columns.Add("<b>Oplosser</b>");
    dtTemp.Columns.Add("<b>Niveau 2</b>");
    DataRow drAddItem;
    for (int i = 0; i < dtOriginal.Rows.Count; i++)
    {
        drAddItem = dtTemp.NewRow();
        drAddItem[0] = dtOriginal.Rows[i][0].ToString();//Melder
        drAddItem[1] = dtOriginal.Rows[i][1].ToString();//Onderwerp
        drAddItem[2] = dtOriginal.Rows[i][2].ToString();//Oplosser
        drAddItem[3] = dtOriginal.Rows[i][3].ToString();//Niveau 2

        dtTemp.Rows.Add(drAddItem);
    }

    //Temp Grid
    DataGrid dg = new DataGrid();
    dg.DataSource = dtTemp;
    dg.DataBind();
    ExportToExcel("Report.xls", dg);
    dg = null;
    dg.Dispose();
}

private void ExportToExcel(string strFileName, DataGrid dg)
{
    Response.ClearContent();
    Response.AddHeader("content-disposition", "attachment; filename=" + strFileName);
    Response.ContentType = "application/excel";
    System.IO.StringWriter sw = new System.IO.StringWriter();
    HtmlTextWriter htw = new HtmlTextWriter(sw);
    dg.RenderControl(htw);
    Response.Write(sw.ToString());
    Response.End();
}

Answer 1

can you try this ?

System.IO.StringWriter sw = new System.IO.StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
Response.AddHeader("content-disposition", "attachment; filename=" + strFileName);
Response.ClearContent();

Response.AddHeader("content-disposition", attachment);

dg.RenderControl(htw);
Response.Write(sw.ToString());
Response.Flush();
Response.End();