public static int SaveMatrix Stream fileStream int int string file Rea

public static int[,] SaveMatrix(Stream fileStream, int N, int M)
        {
            string file = ReadFile(fileStream);
            string[] fileArr;

            file = file.Remove(0, 5);

            fileArr = file.Split(new Char[] {'\n', '\r'}, StringSplitOptions.RemoveEmptyEntries);

            int len = N * M;
            int[,] matrix = new int[len, len];

            for (int i = 0; i < len; i++)
                for (int j = 0; j < len; j++)
                    matrix[i, j] = (int)Char.GetNumericValue(fileArr[i][j]);

            return matrix;
        }