private function generateValidators($colMetadata)
{
$controlId = $colMetadata->ColumnId;
$code = "";
if (!$colMetadata->AllowNull) {
$code .= "\t<com:TRequiredFieldValidator ControlToValidate={$controlId} ValidationGroup=\"addGroup\" Text=\"Field {$controlId} is required.\" Display=\"Dynamic\" />\n";
}
return $code;
}