Test Dictionary class in c#

test.cs

/**
 * Dictionary Test
 */
using System;
using System.IO;
using System.Text;
using System.Collections.Generic;

namespace test {
    class Program {
        static private readonly Dictionary<string,string> _valid = new Dictionary<string,string>{
		{"one","prrr"},
		{"two","gulp"}
	};

        static void Main(string[] args) {
                Console.WriteLine( _valid.ContainsValue("gulp") );
        }
    }
}

TestDictionary.bat

::SET PATH=%PATH%;C:\Windows\Microsoft.NET\Framework\v2.0.50727\
SET PATH=%PATH%;C:\Windows\Microsoft.NET\Framework\v4.0.30319\
::SET PATH=%PATH%;C:\Windows\Microsoft.NET\Framework\v3.5

csc test.cs