Stackoverflow exception infinite loop

Question

Hello guys,

Getting a infinite loop in my code.. I hope someone can help me out here..

static int[,] Sudoku_Solver(int value, int px, int py, int[,] field)
        {
            if (count == 2)
            {

            }
            else
            {
                for (int i = 0; i < 9; i++)
                {
                    for (int j = 0; j < 9; j++)
                    {
                        field[i, j] = fileText[i * size + j] - '0';
                    }
                }

                field[px, py] = value;

                for (int x = 0; x < 9; x++)
                {
                    for (int y = 0; y < 9; y++)
                    {
                        if (field[x, y] == 0)
                        {
                            for (int val = 1; val <= 9; val++)
                            {
                                if (ChkMove(y, x, val, field))
                                {
                                    Sudoku_Solver(val, x, y, field);
                                }
                            }
                            return null;
                        }
                    }
                }
                for (int i = 0; i < 9; i++)
                {
                    for (int j = 0; j < 9; j++)
                    {
                        Console.Write(field[j, i]);
                    }
                    Console.WriteLine();
                }
                Console.WriteLine("---------");
                count = 1;
            }
            return field;
        }

Hope this is enough to detect the problem.

Pasibun