Check out example codes for "select a whole row out of a 2d array C#". It will help you in understanding the concepts better.

Code Example 1

public class CustomArray<T>
{
    public T[] GetColumn(T[,] matrix, int columnNumber)
    {
        return Enumerable.Range(0, matrix.GetLength(0))
                .Select(x => matrix[x, columnNumber])
                .ToArray();
    }

    public T[] GetRow(T[,] matrix, int rowNumber)
    {
        return Enumerable.Range(0, matrix.GetLength(1))
                .Select(x => matrix[rowNumber, x])
                .ToArray();
    }
}

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