Ok, there are multiple options.

Here is the code, you choose the option you want.

It is best to use Option 1 or Option 2. Read this blog at MSDN for a better understanding:
Assembly.CodeBase vs. Assembly.Location

using System;

namespace GetCurrentProcessName
{
    class Program
    {
        static void Main(string[] args)
        {
            // It is best to use Option 1 or Option 2.  Read this:
            // http://blogs.msdn.com/b/suzcook/archive/2003/06/26/assembly-codebase-vs-assembly-location.aspx

            // Option 1 - Using Location (Recommended)
            String fullExeNameAndPath = System.Reflection.Assembly.GetExecutingAssembly().Location;
            String ExeName = System.IO.Path.GetFileName(fullExeNameAndPath);

            // Option 2 - Using CodeBase instead of location
            String fullExeNameAndPathUrl = System.Reflection.Assembly.GetExecutingAssembly().CodeBase;
            String codeBase = System.IO.Path.GetFileName(fullExeNameAndPathUrl);

            // Option 3 - Usable but during debugging in Visual Studio it retuns ExeName.vhost.exe
            String fullVhostNameAndPath = Environment.GetCommandLineArgs()[0];
            String vhostName = System.IO.Path.GetFileName(fullVhostNameAndPath);

            // Option 4 - Also usable but doesn't include the extension .exe and also returns ExeName.vhost
            // during debuggin in visual studio
            String prcessName = System.Diagnostics.Process.GetCurrentProcess().ProcessName;
        }
    }
}

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