Кто может исправить, чтобы матрица сама генерировалась, пожалуйста

using System;

class Program
{
static void Main(string[] args)
{
int[,] matrix = {
{ 1, 2, 3, 4 },
{ 5, 6, -7, 8 },
{ 9, 10, 11, -12 },
{ 13, -14, 15, 16 }
};

int columnsWithoutNegativesSum = 0;
for (int j = 0; j < matrix.GetLength(1); j++)
{
bool hasNegative = false;
int columnSum = 0;
for (int i = 0; i < matrix.GetLength(0); i++)
{
if (matrix[i, j] < 0)
{
hasNegative = true;
break;
}
columnSum += matrix[i, j];
}
if (!hasNegative)
{
columnsWithoutNegativesSum += columnSum;
}
}
Console.WriteLine("Sum of elements in columns without negatives: {0}", columnsWithoutNegativesSum);

int diagonalsSumMin = int.MaxValue;
for (int i = matrix.GetLength(0) - 1; i >= 0; i--)
{
int diagonalSum = 0;
for (int j = 0; i + j < matrix.GetLength(0) && j < matrix.GetLength(1); j++)
{
diagonalSum += Math.Abs(matrix[i + j, j]);
}
diagonalsSumMin = Math.Min(diagonalsSumMin, diagonalSum);
}
for (int j = 1; j < matrix.GetLength(1); j++)
{
int diagonalSum = 0;
for (int i = 0; i < matrix.GetLength(0) && j + i < matrix.GetLength(1); i++)
{
diagonalSum += Math.Abs(matrix[i, j + i]);
}
diagonalsSumMin = Math.Min(diagonalsSumMin, diagonalSum);
}
Console.WriteLine("Min of sums of absolute values of elements on diagonals parallel to the secondary diagonal: {0}", diagonalsSumMin);

Console.ReadKey();
}
}

CSHARP

using System;



class Program

{

    static void Main(string[] args)

    {

        int[,] matrix = {

            {  1,  2,  3,  4 },

            {  5,  6, -7,  8 },

            {  9, 10, 11, -12 },

            { 13, -14, 15, 16 }

        };



        int columnsWithoutNegativesSum = 0;

        for (int j = 0; j < matrix.GetLength(1); j++)

        {

            bool hasNegative = false;

            int columnSum = 0;

            for (int i = 0; i < matrix.GetLength(0); i++)

            {

                if (matrix[i, j] < 0)

                {

                    hasNegative = true;

                    break;

                }

                columnSum += matrix[i, j];

            }

            if (!hasNegative)

            {

                columnsWithoutNegativesSum += columnSum;

            }

        }

        Console.WriteLine("Sum of elements in columns without negatives: {0}", columnsWithoutNegativesSum);



        int diagonalsSumMin = int.MaxValue;

        for (int i = matrix.GetLength(0) - 1; i >= 0; i--)

        {

            int diagonalSum = 0;

            for (int j = 0; i + j < matrix.GetLength(0) && j < matrix.GetLength(1); j++)

            {

                diagonalSum += Math.Abs(matrix[i + j, j]);

            }

            diagonalsSumMin = Math.Min(diagonalsSumMin, diagonalSum);

        }

        for (int j = 1; j < matrix.GetLength(1); j++)

        {

            int diagonalSum = 0;

            for (int i = 0; i < matrix.GetLength(0) && j + i < matrix.GetLength(1); i++)

            {

                diagonalSum += Math.Abs(matrix[i, j + i]);

            }

            diagonalsSumMin = Math.Min(diagonalsSumMin, diagonalSum);

        }

        Console.WriteLine("Min of sums of absolute values of elements on diagonals parallel to the secondary diagonal: {0}", diagonalsSumMin);



        Console.ReadKey();

    }

}