using System;

public class Program

{

    public static void Main()

    {

        System.Collections.Generic.Dictionary<string, string> extendedData = new System.Collections.Generic.Dictionary<string, string> { { "clientWSID", "123" } };

        string wsid = extendedData.TryGetValue("clientWSID", out wsid) ? wsid : "0";

        Console.WriteLine(wsid);

    }

}