Exporting gridview data into excel (.xls,.xlsx) file in asp.net c#

How to export table/gridview/datagrid to excel in asp.net :-

To export a datagrid or a gridview data we have to get rendered html in server side for that we use 'RenderControl' property of controls which gives the render html in a HtmlTextWriter and then copyied

in a StringWriter.

For exporting a table add an attribute Runat='Server' in table

MyTable = ID of Gridview/Datagrid/table (runat='server')

using System.Web.UI.HtmlControls;

protected void ExpToExl()

    {

        System.IO.StringWriter stringWrite = new System.IO.StringWriter();

        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

        Response.Clear();

        Response.AddHeader("content-disposition", "attachment;filename=ExportToExcel.xls");

        Response.ContentType = "application/excel";

        //*********Copying the randered Html in StringWriter**********

        HtmlForm H1 = new HtmlForm();

        H1.Controls.Add(MyTable);

        this.Controls.Add(H1);

        H1.RenderControl(htmlWrite);

        //**************Or Userd this*********

        // MyTable.RenderControl(htmlWrite);

        Response.Write(stringWrite.ToString());

        Response.End();

    }