Multi-dimensional array slicing

ArrayExtensions.cs

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

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