C＃到PHP脚本UploadData

Question

I have C# function that send byte[] to PHP script using this method

webclient.uploadData(string,string,byte[])

anyone tell me how I can get that byte[] array in PHP script??

I tried $_POST,$_REQUEST,$_FILE but I didn't got the same bytes which I send from c# function!!

C# function :

byte[] data = File.ReadAllBytes(FileLocation); 
WebClient client = new WebClient(); 
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded"); 
var text = client.UploadData(URL + "?" + postData), "POST", data);    
MessageBox.Show(System.Text.Encoding.ASCII.GetString(text));

PHP

print_r($_POST);