Calculating distance between 2 points

public int Distance2D(int x1, int y1, int x2, int y2)
       {
           //     ______________________
           //d = √ (x2-x1)^2 + (y2-y1)^2
           //

           //Our end result
           int result = 0;
           //Take x2-x1, then square it
           double part1 = Math.Pow((x2 - x1), 2);
           //Take y2-y1, then sqaure it
           double part2 = Math.Pow((y2 - y1), 2);
           //Add both of the parts together
           double underRadical = part1 + part2;
           //Get the square root of the parts
           result = (int)Math.Sqrt(underRadical);
           //Return our result
           return result;
       }