Simple (mis)use of `System.Configuration.Install` to get a simple key-value collection for command-line parameters. Look into nDesk or other tools for something more robust.

installcontextcommandlineparms.cs

using System;
using System.Configuration.Install;

namespace SimpleCommandlineParms
{
    class Program
    {
        static void Main(string[] args)
        {

            var context = new InstallContext(null, args);
            var parameters = context.Parameters;

            var key = parameters["key"] ?? string.Empty; // replace string.Empty with default
            var target = parameters["target"] ?? string.Empty;
            var flag = ((parameters["flag"] ?? "false").ToLowerInvariant() == "true"); // default to false
            
            Console.WriteLine(string.Format("key: {0} target: {1}", key, target));
            Console.ReadLine();

        }
    }
}