I've managed to create a 2d array, then made it fill up with random numbers, like this:

int[,] grid = new int[5, 5] ;
            Random randomNumber = new Random();
            var rowLength = grid.GetLength(0);
            var colLength = grid.GetLength(1);
            for (int row = 0; row < rowLength; row++)
            {
                for (int col = 0; col < colLength; col++){
                    grid[row, col] = randomNumber.Next(5);
                    Console.Write(String.Format("{0}\t", grid[row, col]));}
                Console.WriteLine();
            }

This results in an array with random values. Example:

3 0 0 3 3
1 3 3 3 2
0 0 2 0 4
3 3 2 0 3
4 0 3 3 0

Notice those three 3s which are connected to each other(in the second row), now how would I check if there's a match like this?