Getting same numbers from random number generator even though it's out of the loop. Why?

This is the code I have wrote for a dice game, I am new the C# so excuse me for it being inefficient:

public class Dice
{
    static public void DiceRoll()
    {
        Random rnd = new Random();
        int roll1 = rnd.Next(1, 7);
        int roll2 = rnd.Next(1, 7);
        int roll3 = rnd.Next(1, 7);
        int roll4 = rnd.Next(1, 7);
        int roll5 = rnd.Next(1, 7);
        int roll6 = rnd.Next(1, 7);
        int roll7 = rnd.Next(1, 7);
        int roll8 = rnd.Next(1, 7);
        int roll9 = rnd.Next(1, 7);
        int roll10 = rnd.Next(1, 7);
        int roll11 = rnd.Next(1, 7);
        int roll12 = rnd.Next(1, 7);
        int Player1Total = roll1 + roll2 + roll3;
        int Player2Total = roll4 + roll5 + roll6;
        int Player1Total2roll = roll7 + roll8;
        int Player2Total2roll = roll9 + roll10;
        int P1froll = roll11;
        int P2froll = roll12;
        int overallP1 = Player1Total + Player1Total2roll + P1froll;
        int overallP2 = Player2Total + Player2Total2roll + P2froll;
        int Player1Score = 0;
        int Player2Score = 0;
        bool gamerunning = false;
        while (gamerunning == false)
        {
            Console.WriteLine("Press anything to roll your die");
            Console.ReadKey();
            Console.Clear();
            Console.WriteLine("\nPlayer1 first dice is ", roll1);
            Console.WriteLine("Player1 second dice is " + roll2);
            Console.WriteLine("Player1 third dice is " + roll3);
            Console.WriteLine("Your total is " + Player1Total);
            Console.WriteLine("\nYour opponents first dice roll is " + roll4);
            Console.WriteLine("Your opponents second dice roll is " + roll5);
            Console.WriteLine("Your opponents third dice roll is " + roll6);
            Console.WriteLine("Your opponents total is " + Player2Total);
            Console.WriteLine("\nPlayer1 first dice is " + roll7);
            Console.WriteLine("Player1 second dice is " + roll8);
            Console.WriteLine("Your total is " + Player1Total2roll);
            Console.WriteLine("\nYour opponents first dice roll is " + roll9);
            Console.WriteLine("Your opponents second dice roll is " + roll10);
            Console.WriteLine("Your total is " + Player2Total2roll);
            Console.WriteLine("\nPlayer1 final roll is " + roll11);
            Console.WriteLine("Your total is " + P1froll);
            Console.WriteLine("\nYour opponents final roll is " + roll12);
            Console.WriteLine("Your total is " + P2froll);
            if (overallP1 > overallP2)
            {
                Player1Score++;
                Console.WriteLine("\nPlayer 1 Wins");
                Console.WriteLine("The Current Score is:");
                Console.WriteLine("Player 1: " + Player1Score);
                Console.WriteLine("Player 2: " + Player2Score);
            }
            else if (overallP2 > overallP1)
            {
                Player2Score++;
                Console.WriteLine("\nPlayer 2 Wins");
                Console.WriteLine("The Current Score is:");
                Console.WriteLine("Player 1: " + Player1Score);
                Console.WriteLine("Player 2: " + Player2Score);
            }
            if (overallP1 == overallP2)
            {
                Console.WriteLine("\nIt's a draw");
            }
            if (Player1Score >= 5)
            {
                gamerunning = true;
            }
            else if (Player2Score >= 5)
            {
                gamerunning = true;
            }
            //if ( Player1Score == Player2Score)
            //{
            //    DiceRoll();
            //}
        }
    }
}

The problem is that I am always getting the same numbers from the generator even though the loop is outside of where I created the random numbers. Does anyone know the problem and has any tips. Thanks in advance.