Random random1 = new Random(Guid.NewGuid().GetHashCode());
            int Random1 = random1.Next(10, 101);
            int Num1 = random1.Next(10, 101);
            int Num2 = random1.Next(10,¨101);
            int Num3 = new int();
            int Num4 = int.Parse(Answer.Text);
            if (Core.Text == "+")
            {
                Num3 = Num1 + Num2;
            }else if (Core.Text == "-")
            {

                Num3 = Num1 - Num2;
            }else if (Core.Text == "X")
            {
               Num3 = Num1 * Num2;
            }else if (Core.Text == ":")
            {
                Num3 = Num1 / Num2;
            }
            if (Num3 == Num4)
            {
            }