Creating a "die roll" program

Question

I have a problem with my code, I want to roll two dies until both get 6, but I can only make to stop the dies when one get 6 and not both. I know that the problem is in the "while" condition, but I don't know how to change it to work, please help. Here's the code:

Console.WriteLine("Roll the dies until you get two sixes");

Random numberGen = new Random();

int rollone = 0;
int rolltwo = 1;
int attempts = 2;

while(()rollone != 6) && (rolltwo != 6))
{
rollone = numberGen.Next(1, 7);
rolltwo = numberGen.Next(1, 7);
Console.WriteLine("\n You rolled: " + rollone + " and " + rolltwo);
attempts++;
}

Console.WriteLine("\nIt took you " + attempts + " attempts to get two sixes");

Answer 1

while(rollone!=6 || rolltwo !=6) // logic or checks both not= before proceeding

while(!(rollone==6 && rolltwo==6)) // logic and needs both to be true, then flips to not

Answer 2

Thanks for the answers, they help me a lot to learn.