I want to save the contents of gridview to the excel file and i am using the following code to done ...

you can use this code just change the gridview1 with your gridview

 private void ExportToExcel()
        {
            HtmlForm form = new HtmlForm();

            string attachment = "attachment; filename=AssignedDoctors.xls";

            Response.ClearContent();

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

            Response.ContentType = "application/ms-excel";

            StringWriter stw = new StringWriter();

            HtmlTextWriter htextw = new HtmlTextWriter(stw);
           
            // put your grid view in here
            form.Controls.Add(GridView1);

            this.Controls.Add(form);

            form.RenderControl(htextw);

            Response.Write(stw.ToString());

            Response.End();
        }