read each line of an input file and put it in a matrix in csharp

main.cs
using System;
using System.IO;

// Create a 2D matrix
int numRows = 3;
int numCols = 4;
int[,] matrix = new int[numRows, numCols];

// Read the input file
using (StreamReader reader = new StreamReader("input.txt"))
{
    string line;
    int row = 0;

    // Read each line of the file
    while ((line = reader.ReadLine()) != null)
    {
        // Split the line into an array of strings
        string[] values = line.Split(' ');

        // Assign the values to the matrix
        for (int col = 0; col < numCols; col++)
        {
            matrix[row, col] = int.Parse(values[col]);
        }

        row++;
    }
}

// Print the matrix
for (int i = 0; i < numRows; i++)
{
    for (int j = 0; j < numCols; j++)
    {
        Console.Write(matrix[i, j] + " ");
    }

    Console.WriteLine();
}
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