using System;

public class Program

{

    public static void Main()

    {

        int[] arrNumbers = new int[5] { 4, 1, 2, 5, 3};

        int SmallestValue = 0;

        int SmallestPosition = 0;

        for (int i = 0; i <= arrNumbers.Length - 1; i++)

        {

            arrNumbers[i] = SmallestValue;

            SmallestPosition = i;

        for (int j = i+1; j <= arrNumbers.Length - 1; j++)

        {

            if (arrNumbers[j] < SmallestValue)

            {

                SmallestValue = arrNumbers[j];

                SmallestPosition = j;

            }

        }

            //swap

            arrNumbers(SmallestPosition = arrNumbers[i]);

            arrNumbers[i] = SmallestValue;

        }

        for (int i = 0; i <= arrNumbers.Length - 1; i++)

        {

    }

}

​