AppDomain.CurrentDomain.BaseDirectory // Directory

using System.Reflection;
Assembly.GetEntryAssembly().Location // Exe File
Assembly.GetExecutingAssembly().GetName().Name // Program Name
Assembly.GetEntryAssembly().GetName().Version;

// GUID
var assembly = typeof(Program).Assembly;
var attribute = (GuidAttribute)assembly.GetCustomAttributes(typeof(GuidAttribute), true)[0];
var id = attribute.Value;

// or (not sure how accurate this is anymore)
static Assembly assembly = Assembly.GetExecutingAssembly();
static Mutex mutex = new Mutex(true, assembly.GetType().GUID.ToString());


public static string AssemblyDirectory {
	get {
		string codeBase = Assembly.GetExecutingAssembly().CodeBase;
		UriBuilder uri = new UriBuilder(codeBase);
		string path = Uri.UnescapeDataString(uri.Path);
		return Path.GetDirectoryName(path);
	}
}