How can we find highest second and lowest second number in a particular array?

Yesterday, I was sitting with my college friends at a coffee shop. One of my friends asked me a question that how we can find highest second and lowest second number in a particular array, and without the help of any function like orderBy. So, I took a notebook and solved his question. Now I am writing a blog on that logic as I want to share my logic with everybody.

Here is my code:-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class secondHighestLowest : System.Web.UI.Page
{
    // this is an array.
    int[] arr = new int[10] { 45, 3, 64, 6, 24, 75, 3, 6, 24, 45 };

    protected void Page_Load(object sender, EventArgs e)
    {
        // calling second highest number method.
        secondHighestNumber();

        // calling second lowest number method.
        secoundLowestNumber();
    }

    /// <summary>
    /// In this function I will get second highest number.
    /// </summary>
    private void secondHighestNumber()
    {
        int firstHighestNumber = arr[0];
        int secondHighestNumber = arr[0];

        // first I am getting highest number of array.
        for(int i = 0; i<arr.Length; i++)
        {
            if (arr[i]>firstHighestNumber)
            {
                firstHighestNumber = arr[i];
            }
        }

        // when I got highest number of array, then I will check the second highest number of array.
        // in if condition I am getting second highest number of array which is not equal to first
        // highest number.
        for (int x = 0; x < arr.Length; x++)
        {
            if (arr[x]>secondHighestNumber && firstHighestNumber!=arr[x])
            {
                secondHighestNumber = arr[x];
            }
        }

        // showing second highest number.
        Response.Write("secondHighestNumber---- " + secondHighestNumber + "</br>");

    }

    /// <summary>
    /// In this function I will get second lowest number.
    /// </summary>
    private void secoundLowestNumber()
    {
        int firstLowestNumber = arr[0];
        int secondLowestNumber = arr[0];

        // first I am getting lowest number of array.
        for (int i = 0; i < arr.Length; i++)
        {
            if (arr[i] < firstLowestNumber)
            {
                firstLowestNumber = arr[i];
            }
        }

        // when I got lowest number of array, then I will check the lowest highest number of array.
        // in if condition I am getting second lowest number of array which is not equal to first
        // lowest number.
        for (int x = 0; x < arr.Length; x++)
        {
            if (arr[x] < secondLowestNumber && firstLowestNumber != arr[x])
            {
                secondLowestNumber = arr[x];
            }
        }
        // showing second lowest number.
        Response.Write("secondLowestNumber---- " + secondLowestNumber + "</br>");
    }
}

Cheers!!
Happy coding:)