webMethods C# messaging clients must reference the dynamic-link library (DLL) webmethods.msg.dll, which implements the C# API. Make sure that the Samples solution contains that reference; if not, use the menu Project > Add Reference to add the C# library to the solution in Visual Studio.

The following figure shows the Visual Studio Solution Explorer with the Samples solution and webMethods C# library installed. The CreateConnection(string, string) method of IConnectionFactory from the C# library is displayed in the Object Browser. In addition, the following references from the Receiver application are called out and highlighted in gray: