int row = 2, col = 3;
        string[,] array=new string[10,10];
        for (int i = 0; i < 10; i++)
        {
            for (int j = 0; j < 10; j++)
            {
                array[i, j] = "1";
            }
        }
        int length1 = array.GetLength(0);
        int length2 = array.GetLength(1);
        int startRow = length1 / 2 -  (row / 2 - 1) - 1 ;
        int startCol = length2 / 2 - (col / 2 - 1) - 1;
        for (int i = startRow; i < startRow + row; i++)
        {
            for (int j = startCol; j < startCol + col; j++)
            {
                array[i,j] = "";
            }
        }