// The following returns the application executable path with exe name
Console.WriteLine(System.Environment.CommandLine);  
//  or 
Console.WriteLine(System.Windows.Forms.Application.ExecutablePath); 
//  or 
Console.WriteLine(System.Reflection.Assembly.GetExecutingAssembly().Location); 
          
 // The following returns just the application executable path
Console.WriteLine(System.Environment.CurrentDirectory);  
//  or 
Console.WriteLine(System.IO.Directory.GetCurrentDirectory()); 
//  or 
Console.WriteLine(System.Windows.Forms.Application.StartupPath); 
//  or 
Console.WriteLine(System.AppDomain.CurrentDomain.BaseDirectory); 
//  or 
Console.WriteLine(System.Reflection.Assembly.GetExecutingAssembly().CodeBase);