// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002174/array-lastindexof

​

// @nuget: Z.ExtensionMethods

​

using System;

​

public class Program

{

    public static void Main()

    {

        String[] strings = { "the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog", "in", "the", "barn" };

        // Searches for the last occurrence of the duplicated value.

        String searchString = "the";

​

        // C# Extension Method: Array - LastIndexOf

        int index = strings.LastIndexOf(searchString);

​

        Console.WriteLine("The first occurrence of \"{0}\" is at index {1}.",

                         searchString, index);

    }

}