CRM 4.0: Missing Classes in Visual Studio

One problem that I have recently come across when attempting to create a custom windows application to interface with Microsoft CRM 4.0 is that some of the classes outlined in the SDK appeared to be missing from the CRM web services, specifically from the CrmService, when I went and added these services to my Visual Studio project as web references. When I then subsequently tried to work through some of the examples outlined in the SDK, this issue would cause errors which would halt the build process, for example: The name 'EntityName' does not exist in the current context The type or names... [More]