HttpWebRequest works. WebClient.UploadFile doesn't - wcf

Question

I thought I figured out a way to simplify my code by using WebClient.UploadFile instead of HttpWebRequest, but I end up getting a file on the server end that is a few dozen bytes too short and corrupted. Any idea where the bug lies?
Thanks
Using HttpWebRequest (works fine):
HttpWebRequest req = (HttpWebRequest)HttpWebRequest
.Create("http://" +
ConnectionManager.FileServerAddress + ":" +
ConnectionManager.FileServerPort +
"/binary/up/" + category + "/" +
Path.GetFileName(filename) + "/" + safehash);
req.Method = "POST";
req.ContentType = "binary/octet-stream";
req.AllowWriteStreamBuffering = false;
req.ContentLength = bytes.Length;
Stream reqStream = req.GetRequestStream();
int offset = 0;
while (offset < ____)
{
reqStream.Write(bytes, offset, _________);
_______
_______
_______
}
reqStream.Close();
try
{
HttpWebResponse resp = (HttpWebResponse) req.GetResponse();
}
catch (Exception e)
{
_____________
}
return safehash;
Using WebClient (corrupt file on server end):
var client = new WebClient();
client.Encoding = Encoding.UTF8;
client.Headers.Add(HttpRequestHeader.ContentType, "binary/octet-stream");
client.UploadFile(new Uri("http://" +
ConnectionManager.FileServerAddress + ":" +
ConnectionManager.FileServerPort +
"/binary/up/" + category + "/" +
Path.GetFileName(filename) + "/" + safehash), filename);
return safehash;
Server side is a WCF service:
[OperationContract]
[WebInvoke(Method = "POST", UriTemplate = "up/file/{fileName}/{hash}")]
void FileUpload(string fileName, string hash, Stream fileStream);

Answer 1

WebClient.UploadFile sends the data in a multipart/form-data format. What you want to use to have the equivalent to the code using HttpWebRequest is the WebClient.UploadData method:
var client = new WebClient();
client.Encoding = Encoding.UTF8;
client.Headers[HttpRequestHeader.ContentType] = "application/octet-stream";
byte[] fileContents = File.ReadAllBytes(filename);
client.UploadData(new Uri("http://" + ConnectionManager.FileServerAddress + ":" +
ConnectionManager.FileServerPort +
"/binary/up/" + category + "/" +
Path.GetFileName(filename) + "/" + safehash), fileContents);