using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        String POstoreIDs = "asdsadsd,asdsadsad,asdsad,asdasd";

        List<String> tempList;

        try {

        foreach (var poID in POstoreIDs.Split(',').ToList())

        {

            Console.WriteLine("poID: " + poID); 

            //tamsmm.addrange(dfdf)

        }

    }catch(Exception ex) {

    Console.WriteLine("Error ex: " + ex.ToString());

    }       

    try {

        tempList =  POstoreIDs.Split(',').ToList();

    Console.WriteLine("tempList count: " + tempList.Count());

    }catch(Exception ex) {

    Console.WriteLine("Error ex: " + ex.ToString());

    }       

        POstoreIDs = "asdasd";

        try {

        tempList =  POstoreIDs.Split(',').ToList();

        Console.WriteLine("tempList count: " + tempList.Count());

    }catch(Exception ex) {

    Console.WriteLine("Error ex: " + ex.ToString());

    }   

        POstoreIDs = "";

        try {

        tempList =  POstoreIDs.Split(',').ToList();

        Console.WriteLine("tempList count: " + tempList.Count());

    }catch(Exception ex) {

    Console.WriteLine("Error ex: " + ex.ToString());

    }   

        Console.WriteLine("Hello World");

    }

}