// C# Extension Method
// Doc: https://csharp-extension.com/en/method/1002616/stringbuilder-appendjoin
// @nuget: Z.ExtensionMethods
using System;
using System.Text;
using System.Collections.Generic;
public class Program
{
public static void Main()
var list = new List<string> {"Fizz", "Buzz"};
var test = new StringBuilder();
// C# Extension Method: StringBuilder - AppendJoin
test.AppendJoin(",", list.ToArray());
Console.WriteLine(test.ToString());
}