Export To Word from GridView

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ASP.NET

I want To export data from gridview to word.

This Is my Code:-

Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition","attachment;filename=GridViewExport.doc");
        Response.Charset = "";
        Response.ContentType = "application/vnd.ms-word ";
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        GridView1.AllowPaging = false;
        GridView1.DataBind();
        GridView1.RenderControl(hw);
        Response.Output.Write(sw.ToString());
        Response.Flush();
        Response.End();

But It show ing error and error is that:-
Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server.

How Can I solve this problem.

Please Help Me.

Thanks.