An application name can be set only once, either through the current property or through a configuration file. If an application is running inside a hosted environment, such as Internet Information Services (IIS), this value might have already been set (usually to the virtual directory). The current property will return null if the application name has not been set.

Namespace: System.Runtime.Remoting
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0