As other sample (Hello world) WCF services, this service is also going to help you understanding how to develop a simple WCF service and its client in Visual Studio.Net, but I tried to explain the way more elaborately. The sample given here is a simple file based employee details repository service. This Article also helps you to know how the client project can discover the WCF service hosted in the server.

Are you using / developing applications for Windows Vista? What if your application requires administrator privileges to perform a task? (For example, probably this would happen when you develop a host application for your WCF Service). This article helps you understanding the UAC clearly and developing application to run with privileged rights.

Usually boolean values are stored as bit fields in database tables. If we require only a few boolean values to be stored in the table, it would be good to have them as separate bit fields. But consider when we want to store some series of boolean values in the database; I have good idea to avoid creating fields for each of such boolean values in the table. For example, choosing weekdays, months in a scheduling kind of problems, attendance for 8 hours of a day in school/college management applications, …

The Visual Basic.Net doesn’t contain the refactoring which is one of the major advantages for the C# programmers. Often I miss the Encapsulate Field feature in VB.Net which helps us for geneting public properties of a class and associated Get & Set methods. Initially I had a thought of doing a code fragment in VB.Net for parsing private data members and automatically generating public properties along with their Set and Get methods.
The hardcore requirement of encapsulation (in Re-factoring) of private members with public properties  comes in the Entity class in …