using System.IO;
using System.Text;

protected override void Render(HtmlTextWriter writer) {
	StringBuilder stringBuilder = new StringBuilder();
	StringWriter stringWriter = new StringWriter(stringBuilder);
	HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
	base.Render(htmlWriter);
	string html = stringBuilder.ToString();

	int start = html.IndexOf("<form name=\"") + 12;
	int end = html.IndexOf("\"", start);
	string formID = html.Substring(start, end - start);
	string replace = formID.Replace(":", "_");
	html = html.Replace("document." + formID, "document." + replace);
	writer.Write(html);
}

Imports System.IO
Imports System.Text

Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
	Dim _stringBuilder As StringBuilder = New StringBuilder()
	Dim _stringWriter As StringWriter = New StringWriter(_stringBuilder)
	Dim _htmlWriter As HtmlTextWriter = New HtmlTextWriter(_stringWriter)
	MyBase.Render(_htmlWriter)
	Dim html As String = _stringBuilder.ToString()

	Dim start As Integer = html.IndexOf("<form name=""") + 12
	Dim end As Integer = html.IndexOf("""", start)
	Dim formID As String = html.Substring(start, end - start)
	Dim replace As String = formID.Replace(":", "_")
	html = html.Replace("document." & formID, "document." & replace)
	writer.Write(html)
End Sub
</pre>