View difference between Paste ID: yGJkYpFn and bTbWitZy

 using System;
 using System.Diagnostics;
 
-namespace PerfTestCSharp {
+namespace NumericPerfTestCSharp {
     class Program {
         static void Main() {
             var collection = new int[100000000];
 
             Benchmark(() => SumForEach(collection), "SumForEach");
             Benchmark(() => SumFor(collection), "SumFor");
 
         }
         static long SumForEach(int[] collection) {
             long sum = 0;
             foreach (var i in collection) {
                 sum += i;
             }
             return sum;
         }
 
         static long SumFor(int[] collection) {
             long sum = 0;
             for (int i = 0; i < collection.Length; ++i) {
                 sum += collection[i];
             }
             return sum;
         }
 
         static void Benchmark<T>(Func<T> func, string message) {
             // warm-up call
             func();
 
             var sw = new Stopwatch();
-            var sw = Stopwatch.StartNew();
+
                 sw.Start();
                 var res = func();
                 sw.Stop();
                 // Write result just to prevent the compiler from optimising away the method call
                 Console.Write(res);
             }
             Console.Write('\n');
             Console.WriteLine(message + " : {0} ms", sw.ElapsedMilliseconds);
         }
     }
 }