using System;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string data = "Method,\"value1,value2\",Method2";

        string[] pieces = Regex.Split(data, ",|(\"[^\"]*\")").Where(exp => !String.IsNullOrEmpty(exp)).ToArray();

        foreach (string piece in pieces)

        {

            Console.WriteLine(piece);

        }

    }

}