需把一简单php代码转为asp.net2.0或更高版的代码解决思路

需把一简单php代码转为asp.net2.0或更高版的代码
下面的是全部源码,没有几行,主要是没有学过php,对于学过的应不是什么问题
$imageDirectory   =   $_GET[ 'seed '];
if(!is_dir( "./images/uploaded/$imageDirectory "))   mkdir( "./images/uploaded/ ",   0755);
$dotLocation   =   strrpos($_FILES[ 'Filedata '][ 'name '],   '. ');
$newFileName   =sanitizeText(substr($_FILES[ 'Filedata '][ 'name '],   0,   $dotLocation))   .   substr($_FILES[ 'Filedata '][ 'name '],   $dotLocation);

move_uploaded_file($_FILES[ 'Filedata '][ 'tmp_name '],   "./images/uploaded/ "   .   $newFileName);
chmod( "./images/uploaded/ ".$_FILES[ 'Filedata '][ 'name '],   0777);

function   sanitizeText($text)
{
$title   =   strip_tags($text);

$title   =   preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])| ',   '---$1--- ',   $title);

$title   =   str_replace( '% ',   ' ',   $title);

$title   =   preg_replace( '|---([a-fA-F0-9][a-fA-F0-9])---| ',   '%$1 ',   $title);

$title   =   strtolower($title);
$title   =   preg_replace( '|/+| ',   '- ',   $title);
$title   =   preg_replace( '/&.+?;/ ',   ' ',   $title);   //   kill   entities
$title   =   preg_replace( '/[^%a-z0-9   _-]/ ',   ' ',   $title);
$title   =   preg_replace( '/\s+/ ',   '- ',   $title);
$title   =   preg_replace( '|-+| ',   '- ',   $title);
$title   =   trim($title,   '- ');

return   $title;
}
?>

------解决方案--------------------
string imageDirectory = resquest.queryString('seed ');
------解决方案--------------------