System.AppDomain.CurrentDomain.BaseDirectory

System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName)
	
System.Reflection.Assembly.GetExecutingAssembly().Location
	
String exePath = System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0].FullyQualifiedName;
 string dir = Path.GetDirectoryName(exePath);
	
string baseDir = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
	
1. string baseDir =   
    System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
 2. String exePath = System.Environment.GetCommandLineArgs()[0];
 3. string appBaseDir =    System.IO.Path.GetDirectoryName
    (System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);