public function RemoveColumnsByName($strName)
{
$this->blnModified = true;
for ($intIndex = 0; $intIndex < count($this->objColumnArray); $intIndex++) {
if ($this->objColumnArray[$intIndex]->Name == $strName) {
array_splice($this->objColumnArray, $intIndex, 1);
$intIndex--;
}
}
}