Render control error[un handle exception]

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Hi All,

I am getting error while using render control Unhandle exception it showing i place gridview in form tag only.

C#

XmlTextReader xtr = new XmlTextReader("http://localhost:50197/Trail4/xml/xmltest.xml");
        DataSet ds = new DataSet();
        ds.ReadXml(xtr);
        xtr.Close();
        GridView1.DataSource = ds;
           
        
        GridView1.DataBind();
        Response.ClearContent();
        Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "xml.doc"));
        Response.Charset = "";
        Response.ContentType = "application/ms-word";
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);
       GridView1.RenderControl(htw);
      
        Response.Write(sw.ToString());
        Response.End();

Posted 27-May-12 20:15pm

jvamsikrishna

Updated 27-May-12 20:46pm

Sandeep Mewara

v2

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Sandeep Mewara · Accepted Answer · 2012-05-27T20:54:00

Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server
The above exception occurs when one tries to export a GridView control to Word, Excel, PDF, CSV or any other formats.

Reason:
.NET compiler thinks that the control is not added to the form and is rendered.

Solution:
Tell compiler that the control is rendered explicitly by overriding the VerifyRenderingInServerForm event.
Something like:

C#

public override void VerifyRenderingInServerForm(Control control)
{
    /* Verifies that the control is rendered */
}

This Error/issue reported & resolution suggested by MS here: RenderControl doesn't work for GridView[^]