How to covert php code into asp.net

<?php

if(isset($GLOBALS["HTTP_RAW_POST_DATA"])){
$flv = $GLOBALS["HTTP_RAW_POST_DATA"];
$filename =  $_GET["id"]. ".flv";
file_put_contents($filename, $flv);
} else{
echo "Encoded flv information not received.";
}
?>

I need this same functionality in asp.net.  Please let me know the solution.