// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002165/string-join

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        String[] values = {"apple", "orange", "grape", "pear"};

        String sep   = ", ";

        // C# Extension Method: String - Join

        var result = sep.Join(sep, values);

        Console.WriteLine(result);

    }

}