public static void RedirectErr(TextWriter sw)
{
if (sw != null)
{
Err.Redirect(sw);
_errorWriter = sc.Error;
sc.SetError(sw);
IsErrorRedirected = true;
}
else
{
Err.Redirect((TextWriter)null);
sc.SetError(_errorWriter);
_errorWriter = null;
IsErrorRedirected = false;
}
}