WebControl in einen String rendern.

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public string RenderControl2String(Control ctrl)
{
  System.Text.StringBuilder sb = new System.Text.StringBuilder();
  System.IO.StringWriter sw = new System.IO.StringWriter(sb);
  System.Web.UI.HtmlTextWriter tw = new HtmlTextWriter(sw);
  ctrl.RenderControl(tw);
  return sb.ToString();
}