Changes for C# Code

[scotttib]

Dave,
Great Video and Videos!
thanks, Scott...

Changes for better results in C#:

In validateResults()
if (myDict.ContainsKey(this.sieveSize))
return this.myDict[this.sieveSize] == this.countPrimes();
return false;

To: (closer match to C++ code, and sb faster)
return myDict.TryGetValue(this.sieveSize, out int test) && test == this.countPrimes();

In countPrimes()
for (int i = 0; i < this.bitArray.Count; i++)

To: (know this shouldn't matter, but it seems to help most of the time)
int hold = this.bitArray.Count;
for (int i = 0; i < hold; i++)

Consider changing:
project properties->Build->advance-> set output debug to None (helps little bit, not sure why)
&
C#'s DateTime class is slow (this change help a lot)
A better way is using System.Diagnostics.StopWatch (This class is available in c++ too)

Code would be:
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();

            var passes = 0;
            prime_sieve sieve = null;

            while (stopWatch.Elapsed.TotalSeconds < 10)
            {
                sieve = new prime_sieve(1000000);
                sieve.runSieve();
                passes++;
            }

            stopWatch.Stop();
            
            if (sieve != null)
                sieve.printResults(false, stopWatch.Elapsed.TotalSeconds, passes);