private static Action<int> CheckDuration(Action action)
    private static Action<int> CheckDuration<T>(Action<T> action, T arg)

private static Action<int> CheckDuration<T, U>(
        Action<T, U> action, T arg1, U arg2)

private static Action<int> CheckDuration<params T>(
      Action<params T> action, params T arg)

public static class MethodTimer
{
    public static long Run(Action action)
    {
        var sw = System.Diagnostics.Stopwatch.StartNew();
        action();
        sw.Stop();
        return sw.ElapsedMilliseconds;
    }
}
class Program
{
    static void Main(string[] args)
    {
        long time = MethodTimer.Run(() => File.Open(@"c:test.txt",
            FileMode.CreateNew));
        Console.WriteLine(time);
        Console.ReadLine();
    }
}

Action act = () => File.Open(@"c:test.txt", FileMode.CreateNew);
        time=act.Time();

public static class MethodTimer
    {
        public static long Time(this Action action)
        {
            var sw = System.Diagnostics.Stopwatch.StartNew();
            action();
            sw.Stop();
            return sw.ElapsedMilliseconds;
        }
    }

MethodTimer.Time(()=> File.Open("",FileMode.Open);
MethodTimer.Time(()=> myObject.TestMethod(123,1231,"another param"));

Action<int> CheckDuration<T>(Action<T> action, params T[] args)
    where T : ISupportCheckDuration