Add an “Export to Excel” button to a webpage to export gridview to excel in webapplication

Question

i built a patient management software for a clinic and i need to export patiet list from ASP.net grid view to excel file

my question is:

Is there a way to ex

Answer 1

first you have to add the following to the page directive to avoid runtime error

 EnableEventValidation ="false"

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add gridview to aspx page the session "dsource" is passing the datasource from advanced search page containing the connection string and select command then here is the code behind

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Threading;
using System.IO;
using System.Reflection;

public partial class csresults : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

    gridview1.DataSource = Session["dsource"];
    gridview1.DataBind();




}


  public override void VerifyRenderingInServerForm(Control control)
{

}



protected void Button2_Click(object sender, EventArgs e)
{
    HtmlForm form = new HtmlForm();
    string attachment = "attachment; filename=Patients.xls";
    Response.ClearContent();
    Response.AddHeader("content-disposition", attachment);
    Response.ContentType = "application/ms-excel";
    StringWriter stw = new StringWriter();
    HtmlTextWriter htextw = new HtmlTextWriter(stw);
    form.Controls.Add(gridview1);
    this.Controls.Add(form);
    form.RenderControl(htextw);
    Response.Write(stw.ToString());
    Response.End();
}

}