SO post http://stackoverflow.com/a/29379865/108993

methods.cs

/*
output (cpu: i7 920)

Starting Benchmark
Running iteration: 1000/1000
Running 1000000 sub-iterations - Time Taken: 00:00:00.0043953
Running 1000000 sub-iterations - Time Taken: 00:00:00.0037585
Test 1
    Average Time: 00:00:00.0043999
    Invalid Operations: 750007614 (75.001 %)
Test 2
    Average Time: 00:00:00.0037506
    Invalid Operations: 750007614 (75.001 %)
Finished Benchmark
Press any key to exit...
*/

//...
        static long RunLoop1(int[] indexArgs, int[] sizeArgs, ref long invalidOperationCount)
        {
            Stopwatch sw = new Stopwatch();

            Console.Write("Running {0} sub-iterations", LoopCount);
            sw.Start();
            long startTickCount = sw.ElapsedTicks;

            for (int i = 0; i < LoopCount; i++)
            {
                var index = indexArgs[i];
                var size = sizeArgs[i];
                invalidOperationCount += (index < 0 || index >= size) ? 1 : 0;
            }

            sw.Stop();
            long stopTickCount = sw.ElapsedTicks;

            long elapsedTickCount = stopTickCount - startTickCount;
            Console.WriteLine(" - Time Taken: {0}", new TimeSpan(elapsedTickCount));
            return elapsedTickCount;
        }
        
        static long RunLoop2(int[] indexArgs, int[] sizeArgs, ref long invalidOperationCount)
        {
            Stopwatch sw = new Stopwatch();

            Console.Write("Running {0} sub-iterations", LoopCount);
            sw.Start();
            long startTickCount = sw.ElapsedTicks;

            for (int i = 0; i < LoopCount; i++)
            {
                var index = indexArgs[i];
                var size = sizeArgs[i];
                invalidOperationCount += ((uint)(index) >= (uint)(size)) ? 1 : 0;
            }

            sw.Stop();
            long stopTickCount = sw.ElapsedTicks;

            long elapsedTickCount = stopTickCount - startTickCount;
            Console.WriteLine(" - Time Taken: {0}", new TimeSpan(elapsedTickCount));
            return elapsedTickCount;
        }