Getting the application's directory from a WPF application

One method:

System.AppDomain.CurrentDomain.BaseDirectory

Another way to do it would be:

System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName)

Here is another:

System.Reflection.Assembly.GetExecutingAssembly().Location

You can also use the first argument of the command line arguments:

String exePath = System.Environment.GetCommandLineArgs()[0]