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    copied!<p>it seemed strange to me that you would have the problems you mentioned, so I was curious and put together an implementation using your service contract. That one actually worked straight away. I don't actually know what went wrong in your case (it's not obvious), but let me just post a working solution here hoping that this will help you to solve your problem.</p> <p>Unfortunately, as I abandoned VB many years ago, I can only provide C# code. Hope that's alright.</p> <p><strong>Server Web.config (tested in IIS, with net.tcp binding):</strong></p> <pre><code> &lt;system.serviceModel&gt; &lt;bindings&gt; &lt;netTcpBinding&gt; &lt;binding transferMode="Streamed" maxReceivedMessageSize="1000000"&gt; &lt;security mode="None"/&gt; &lt;/binding&gt; &lt;/netTcpBinding&gt; &lt;/bindings&gt; &lt;services&gt; &lt;service name="ImageSystem.SVC.UploadService"&gt; &lt;endpoint address="" binding="netTcpBinding" contract="ImageSystem.SVC.IUploadService"&gt; &lt;/endpoint&gt; &lt;endpoint address="mex" kind="mexEndpoint" binding="mexTcpBinding"/&gt; &lt;/service&gt; &lt;/services&gt; &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior&gt; &lt;serviceMetadata httpGetEnabled="false"/&gt; &lt;serviceDebug includeExceptionDetailInFaults="true"/&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; &lt;/system.serviceModel&gt; </code></pre> <p><strong>Client app.config (console test app):</strong></p> <pre><code>&lt;system.serviceModel&gt; &lt;bindings&gt; &lt;netTcpBinding&gt; &lt;binding transferMode="Streamed" maxReceivedMessageSize="1000000"&gt; &lt;security mode="None"/&gt; &lt;/binding&gt; &lt;/netTcpBinding&gt; &lt;/bindings&gt; &lt;client&gt; &lt;endpoint address="net.tcp://localhost/WcfService1/UploadService.svc" binding="netTcpBinding" contract="ImageServices.IUploadService" name="NetTcpBinding_IUploadService"&gt; &lt;/endpoint&gt; &lt;/client&gt; &lt;/system.serviceModel&gt; </code></pre> <p><strong>Service contract &amp; implementation:</strong></p> <pre><code>[ServiceContract(Namespace="urn:ImageSystem")] public interface IUploadService { [OperationContract] ImageUpload UploadFile(ImageUpload file); } [MessageContract] public class ImageUpload { [MessageHeader] public long? ImageID { get; set; } [MessageBodyMember] public Stream Data; } public class UploadService : IUploadService { public ImageUpload UploadFile(ImageUpload file) { long length; using (var ms = new MemoryStream()) { file.Data.CopyTo(ms); length = ms.Length; } return new ImageUpload { ImageID = length, Data = new MemoryStream() }; } } </code></pre> <p>Test app:</p> <pre><code>private static readonly string imgPath = @"C:\Pictures\somepicture.jpg"; private static readonly EventWaitHandle waitHandle = new AutoResetEvent(false); static void Main() { long? result; using (var service = new ImageServices.UploadServiceClient("NetTcpBinding_IUploadService")) { var image = new ImageServices.ImageUpload(); using (var imgStream = File.OpenRead(imgPath)) { image.Data = imgStream; service.UploadFileCompleted += (sender, e) =&gt; { result = e.Result; if (e.Data != null) image.Data.Dispose(); waitHandle.Set(); }; service.UploadFileAsync(null, imgStream); waitHandle.WaitOne(); } } } </code></pre> <p>First of all, as you can see, the config files can be a lot simpler. Especially the large <code>BufferSize</code> value is not necessary. Then, with regard to the service contract, it's not clear to me why the <code>Upload</code> operation would receive AND return an <code>ImageUpload</code> message. In my implementation, I'm returning the uploaded file size in the <code>ImageID</code> parameter just for demo purposes, of course. I don't know what your reasoning behind that contract was, and what you actually would want to return.</p> <hr> <p>Actually, was just about to click "Send" when I had an idea why your code could have failed. In your test client, before you call <code>serviceClient.UploadFileAsync()</code>, add this line to your code: <code>ms.Seek(0, SeekOrigin.Begin)</code>. </p> <p>This resets the position of the MemoryStream back to its beginning. If you don't do that, the MemoryStream will be consumed only from its current position, which is its end - and which explains the Length = 0 of the stream received on the service side!</p>
 

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