static int[,] GetArrayFromFile(string fileName)
{
    if (!File.Exists(fileName))
        return null;
    string[] lines = File.ReadAllLines(fileName);
    int rowCount = lines.Length;
    if (rowCount == 0)
        return null;
    int colCount = lines[0].Split().Length;
    if (colCount == 0)
        return null;
    int[,] array = new int[rowCount, colCount];
    for (int i = 0; i < rowCount; i++)
    {
        string[] line = lines[i].Split();
        for (int j = 0; j < colCount; j++)
        {
            array[i, j] = int.Parse(line[j]);
        }
    }
    return array;
}