using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string address1 = "Address1";

        string address2 = "Address2";

        string city = "City";

        string country = "Country";

        string postalCode = "00000";

        List<string> strArray = new List<string> { address1, address2, city, country, postalCode };

        string fullAddress = string.Join(",", strArray.Where(m=> !string.IsNullOrEmpty(m)).ToList());

        Console.WriteLine(fullAddress);

        address1 = "Address1";

        address2 = "Address2";

        city = "City";

        country = "";

        postalCode = "00000";

        strArray = new List<string> { address1, address2, city, country, postalCode };

        fullAddress = string.Join(",", strArray.Where(m=> !string.IsNullOrEmpty(m)).ToList());

        Console.WriteLine(fullAddress);

    }

}