C# array sorting | Sorting numbers in C#

using System;

namespace ClassRoomSamples

{

    class Demo05ArraySorting

    {

        static void Main(String[] anyname)

        {

            int[] a = new int[10];

            Console.WriteLine("How many numbers needed to sort(Max 10)?");

            int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)

            {

                a[i] = int.Parse(Console.ReadLine());

            }

            //Starting with 0 as selected-index and proceeding up to n-1

            for (int SelectedIndex = 0; SelectedIndex < n-1;                                                                     SelectedIndex++)

            {

                //searching if any small value occurring...

                for (int followingIndex=SelectedIndex+1;followingIndex<n;                                                          followingIndex++)

                {

                    //if following position's value is smaller than 

                    //the selected-index value

                    if (a[SelectedIndex] > a[followingIndex])

                    {

                        //then Swap values

                        int backUp = a[SelectedIndex];

                        a[SelectedIndex] = a[followingIndex];

                        a[followingIndex] = backUp;

                    }

                }

            }

            Console.WriteLine("Sorted Array values");

            for (int i = 0; i < n; i++)

            {

                 Console.WriteLine(a[i]);

            }

            Console.ReadKey();

        }

    }

}

Output

How many numbers needed to sort (Max 10)?
6

12
15
10
13
18
17

Sorted Array values
10
12
13
15
17
18