exporting gridview to word

     protected void Button2_Click(object sender, EventArgs e)
        {
            Response.Clear();
            Response.Buffer = true;
            Response.AddHeader("content-disposition",
            "attachment;filename=GridViewExport.doc");
            Response.Charset = "";
            Response.ContentType = "application/vnd.ms-wor开发者_StackOverflowd ";
            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            GridView1.AllowPaging = false;
            GridView1.RenderControl(hw);
            Response.Output.Write(sw.ToString());
            Response.Flush();
            Response.End();
        }
        public override void VerifyRenderingInServerForm(Control control)
        {
            /* Verifies that the control is rendered */
        }  

this is my code in the .cs file what am trying to do is export a gridview to word file but when i run the code it gives an error

RegisterForEventValidation can only be called during Render(); pls help

Copying the answer from comment:

got the answer guys EnableEventValidation ="false" just have to add this in the page directive