using System;

using System.Collections.Generic;

​

public class Program

{

​

    //it orders the elements randomly, 

    //then it selects each element multiplied by 10 raised to the power of its index, 

    //then sums them together and casts the result to an integer.

    public static int getInteger() 

    {

        List<int> array2 = new List<int> { 1, 3, 5, 7, 9 };

        var random = new Random();

        var total = (int)array2.OrderBy(digit => random.Next()).Select((digit, index) => digit*Math.Pow(10, index)).Sum();

        return total;

    }

    public int[] Shuffle(int[] Sequence)

{

    // public method's arguments validation

    if (null == Sequence)

        throw new ArgumentNullException(nameof(Sequence));

​

    // No need in Array if you want to modify Sequence

​

    for(int s = 0; s < Sequence.Length - 1; s++)

    {

        int GenObj = GenerateAnotherNum(s, Sequence.Length); // pleace, note the range

​

        // swap procedure: note, var h to store initial Sequence[s] value

        var h = Sequence[s];          

        Sequence[s] = Sequence[GenObj];

        Sequence[GenObj] = h;

    }

​

    return Sequence;

}

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}