Second Smallest and Second Largest in an array

using System;

using System.Collections.Generic;

using System.Text;

using System.Collections;

 

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int[] arr = {1,2,3,4,5,6,7,8,9,10};

            int smallest, secsmallest, largest, seclargest;

            //Take the first two elements as largest and secondlargest according to the following conditions.

            if (arr[0] < arr[1])

            {

                smallest = arr[0];

                secsmallest = arr[1];

                largest = arr[1];

                seclargest = arr[0];

            }

            else

            {

                smallest = arr[1];

                secsmallest = arr[0];

                largest = arr[0];

                seclargest = arr[1];

            }

            for (int i = 2; i < arr.Length; i++)

            {

                if (arr[i] < smallest || arr[i] > largest)

                {

                    //Element is smaller than smallest, smallest becomes secondsmallest.

                    if (arr[i] < smallest)

                    {

                        secsmallest = smallest;

                        smallest = arr[i];

                    }

                    //Element is larger than largest, largest becomes secondlargest.

                    else

                    {

                        seclargest = largest;

                        largest = arr[i];

                    }

                }

                else if ((arr[i]>smallest && arr[i]<secsmallest) ||     

                         (arr[i]<largest && arr[i]>seclargest))

                {

                    //Element lies between the largest and secondlargest, secondlargest assigned element.

                    if (arr[i] > smallest && arr[i] < secsmallest)

                    { secsmallest = arr[i]; }

                    else

                    { seclargest = arr[i]; }

                }

            }

            Console.WriteLine("Second smallest: " + secsmallest);

            Console.WriteLine("Second largst: " + seclargest);

        }

    }

}