Why do I receive “Invalid pipe handle” when accessing an anonymous pipe?

I tried to use anonymous pipes in C#, but it fails even with the most basic example. Here's the server console app: ``` namespace Server { using System; using System.Diagnostics; using System.IO.Pipes; public static class Program { public static void Main() { using (var pipe = new AnonymousPipeServerStream(PipeDirection.In)) { var pipeName = pipe.GetClientHandleAsString(); var startInfo = new ProcessStartInfo("Client.exe", pipeName); startInfo.UseShellExecute = false; using (var process = Process.Start(startInfo)) { pipe.DisposeLocalCopyOfClientHandle(); var receivedByte = pipe.ReadByte(); Console.WriteLine( "The client sent the following byte: " + receivedByte); process.WaitForExit(); } } Console.WriteLine("Press any key to continue..."); Console.ReadKey(true); } } } ``` And here is the source code of the console client app: ``` namespace Client { using System.IO.Pipes; public static class Program { public static void Main(string[] args) { using (var pipe = new AnonymousPipeClientStream( PipeDirection.Out, args[0])) { pipe.WriteByte(0x65); } } } } ``` When I launch the server, the client app crashes (with Windows "Client has stopped working" dialog). The server displays: The client sent the following byte: -1 Unhanded Exception: System.IO.IOException: Invalid pipe handle. at […] at Client.program.Main(String[] args) in C:\[…]\Client\Program.cs:line 9 What am I doing wrong?