// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002635/array-findall

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] values = GetArray(50, 0, 1000);

        int lBound = 300;

        int uBound = 600;

​

        // C# Extension Method: Array - FindAll

        int[] matchedItems = values.FindAll(x => x >= lBound && x <= uBound);

​

        for (int ctr = 0; ctr < matchedItems.Length; ctr++)

        {

            Console.Write("{0}  ", matchedItems[ctr]);

            if ((ctr + 1) % 12 == 0)

                Console.WriteLine();

        }

    }

​

    private static int[] GetArray(int n, int lower, int upper)

    {

        Random rnd = new Random();

        List<int> list = new List<int>();

        for (int ctr = 1; ctr <= n; ctr++)

            list.Add(rnd.Next(lower, upper + 1));

​

        return list.ToArray();

    }

}