c# - HTTP request with POST - data will not be displayed -

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i'm trying post data php page using c#.

i tried msdn example (i changed postdata "xml=test") , tried example of this post.

the php page simple. contains:

<?php echo "postdata<br>"; echo "<pre>"; print_r($_post); echo "</pre>"; ?>

i wrote simple html file testing. contained form post data.

<html> <body> <form action = "https://myurl/upload/uploadtest.php" method = "post"> <input name = "xml" value="test"><p> <input type = "submit" value="absenden"> </form> </body> </html>

the response of html site is:

postdata array (     [xml] => test )

this means me connection , php file ok.

but response of c# code is:

ok  postdata<pre>array ( ) </pre>

the "ok" comes "(((httpwebresponse)response).statusdescription)" , rest "reader.readtoend()".

can tell me why html file works , c# not?
, how can c# upload working?


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