Part 97 Performance of a multithreaded program

class Program
{
static void Main(string[] args)
{
Stopwatch s = new Stopwatch();
s.Start();
EvenNumbersSum();
OddNumbersSum();
s.Stop();
Console.WriteLine("before using multiple threads"+s.ElapsedMilliseconds);
s = new Stopwatch();
s.Start();
Thread t1 = new Thread(EvenNumbersSum);
Thread t2 = new Thread(OddNumbersSum);
t1.Start();
t2.Start();
t1.Join();
t2.Join();
s.Stop();
Console.WriteLine("after using multiple threads"+s.ElapsedMilliseconds);

}

public static void EvenNumbersSum()
{
double sum=0;
for(int i=0;i<=50000000;i++)
{
if(i%2==0)
{
sum += i;
}
}
Console.WriteLine("sum= "+sum);
}

public static void OddNumbersSum()
{
double sum = 0;
for (int i = 0; i <= 50000000; i++)
{
if (i % 2 == 1)
{
sum += i;
}
}
Console.WriteLine("sum= " + sum);
}
}