Why doesn't the second random variable (Number2) change?

This program tests you on 10 questions that are 1 digit additions. When I run the code, the randomly generated Number1 value changes, however Number2 does not. Why isn't Number2 changing?

using System;

namespace Addition_test
{
    class Program
    {
        static int Test()
        {
            int AnswersCorrect = 0;

            for (int Counter = 0; Counter < 10; Counter++)
            {
                Random Num1 = new Random();
                int Number1 = Num1.Next(1, 10);

                Random Num2 = new Random(1);
                int Number2 = Num2.Next(1, 10);

                int Answer = Number1 + Number2;
                Console.WriteLine("What is " + Number1 + "+" + Number2 + "?");
                int Answer_entered = Convert.ToInt32(Console.ReadLine());

                if (Answer_entered == Answer)
                {
                    Console.WriteLine("Correct"); 
                    AnswersCorrect++;
                }
                else
                {
                    Console.WriteLine("Incorrect");
                }
            }

            return  AnswersCorrect;
        }

        static void Main(string[] args)
        {
            int Result = Test();

            Console.WriteLine("You got {0}/10 questions correct", Result);
            Console.ReadLine();
        }
    }
}