I see that there are some ways to get the application folder path:
Application.StartupPath
System.IO.Path.GetDirectoryName( System.
this one System.IO.Path.GetDirectory(Application.ExecutablePath) changed to System.IO.Path.GetDirectoryName(Application.ExecutablePath)
System.IO.Path.GetDirectory(Application.ExecutablePath)
System.IO.Path.GetDirectoryName(Application.ExecutablePath)