Export HTML

[dummyagain]

I have the following error when exporting the page (containing gridview) to HTML page.

Error:
RegisterForEventValidation can only be called during Render();

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: RegisterForEventValidation can only be called during Render();

Here is my code


protected void exportHTML_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=FileName.htm");
Response.Charset = "";
Response.ContentType = "text/html";
StringBuilder SB = new StringBuilder();

System.IO.StringWriter stringWrite = new System.IO.StringWriter(SB);
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
gvTopic.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();

}

public override void VerifyRenderingInServerForm(Control control)
{
/* Confirms that an HtmlForm control is rendered for the specified ASP.NET
server control at run time. */
}