Benchmark.NET makes it easier to measure the execution time of a piece of code.
Internally it uses System.Diagnostics.Stopwatch so it is of higher precision that querying System.DateTime.Now.
Instead of :
var sw = Stopwatch.StartNew();
for(i = 0; i < 1000; i++)
var ticksPerIteration = sw.Elapsed.Ticks / i;
you can just :
var result = Benchmark.Sequentially(()=>TestSomePieceOfCode());
Also, you can do parallel benchmarks, useful when, for example, you are testing a remote service and see how it holds under a certain number of clients.
Samples included in code.