how to get sum of 1 to 100 prime number?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace pm
{
    class Primes
    {
        static void Main(string[] args)
        {
           
          int n = 2, totalPrimeNumbers = 1, x;
            double sumOfPrimes = 2, average;
          
            while (n <= 100)
            {
                // test if n is prime
                for (x = 2; x < n; x++)
                {
                    if ((n % x) != 0)
                    {
                        sumOfPrimes = sumOfPrimes + n;
                        totalPrimeNumbers++;
                        // change value of x to end for loop
                        x = n + 1;
                    }
                }
                // increase n by 1 to test next number
                n++;
            }
            Console.WriteLine("Sum - " + sumOfPrimes);
            
        }
        }
}