Below is an example that gives the sum of even numbers between 1 and 100 (including 100) in the C# programming language.

namespace ConsoleApplicationTest
{
    class Program {

        static void Main(string[] args) {

            int total = 0;

            for (int i = 0; i <= 100; i++) {

                if (i % 2 == 0) {
                    total += i;
                }
            }

            Console.WriteLine(total);

            Console.ReadLine();            
        }
    }
}

Between 1 and 100 (including 100) the "for loop" is executed. Inside the loop, it is checked whether the value incremented by 1 each time (variable i) is divided by "%2" by 2 (i % 2 == 0 Here means the remainder of the division by 2 is zero?). If the result is "true", our variable "i" is cumulatively added to our variable "sum", which is defined outside of the loop and collects the values.

The result would be 2550..