6 ways to get the current directory in C#

Different approaches to getting the assembly or application's current directory.

AppDomain.CurrentDomain.BaseDirectory

This is the best option all round. It will give you the base directory for class libraries, including those in ASP.NET applications.

Directory.GetCurrentDirectory()

This does an interop call using the winapi GetCurrentDirectory call inside kernel32.dll, which means the launching process' folder will often be returned. Also as the MSDN documents say, it's not guaranteed to work on mobile devices.

Environment.CurrentDirectory

This simply calls Directory.GetCurrentDirectory()

Assembly.Location

This would be called using

this.GetType().Assembly.Location

This returns the full path to the calling assembly, including the assembly name itself. If you are calling a separate class library, then its base directory will be returned, such "C:\myassembly.dll" - depending obviously on which Assembly instance is being used.

Application.StartupPath

This is inside the System.Windows.Forms namespace, so is typically used in window forms application only.

Application.ExecutablePath

The same as Application.StartupPath, however this also includes the application name, such as "myapp.exe"