This example demonstrates how can we get application or assembly folder.

Geting Directory of the windows forms application

To get directory we need to use static property ExecutablePath from Application in System.Window­s.Forms namespace.

By using static method GetDirectoryName of Path class we can get only the folder part of the path.

string appPath = Path.GetDirectoryName(Application.ExecutablePath);

Getting Directory of loaded assembly

By using the method Assembly.GetE­xecutingAssem­bly we can get assembly of currently executing program.
By using method Assembly.GetAs­sembly we can get assembly in which the specified class is defined. Finally, we can get a assembly file path using Assembly.CodeBase property.

string appPath = Path.GetDirectoryName(
                     Assembly.GetAssembly(typeof(MyClassName)).CodeBase);