using System; 

using System.Text.RegularExpressions;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var label ="the name fiels_ contain's some.thing,not allowed\n\rand /Por que te estás riendo:also 你为什么笑";

        var storename =label.Replace(".", string.Empty);

         storename = Regex.Replace(storename,@"[^a-zA-z0-9_]","_");

        Console.WriteLine(label);

        Console.WriteLine(storename);

         Dictionary<string, string> dict = new Dictionary<string, string>();

 dict.Add("UserID", "test");

 string userIDFromDictionaryByKey ;

        dict.TryGetValue("UserID",out userIDFromDictionaryByKey);

            Console.WriteLine(userIDFromDictionaryByKey);

    }

}