HTTP Request

[Oli Kai]

I got a problem with HTTP Requests.

Here is the POST Request I want to get the respond to:
<div id="tabs-2">
<div class="form" id="upload_form">
<p>Please select a container file to upload.</p>
<form action="/decrypt/upload" method="post" enctype="multipart/form-data">
<fieldset>
<p class="formrow file_upload">
<label for="dlcfile">Container File</label>
<input type="file" class="file_field" name="dlcfile" id="dlcfile"/>
<input type="text" value="Click here to select a file..." class="file_overlay" />
</p>
<p class="buttonrow"><button type="submit">Submit »</button></p>
</fieldset>
</form>
</div>
</div>

And here is my C# Code
public static void decryptContainer(string path)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/upload");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";


using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII))
{
writer.Write("dlcfile=" + path);
}

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
Console.WriteLine(reader.ReadToEnd());
}
}

I get an unhandled WebException, and I think it´s because I submit a string as path, but the script wants a "file", but I dont know how to submit it. Can someone help me with that?