static void Main(string[] args)
{
TokenManager tokenManager = new TokenManager();
tokenManager.AddToken("yukan", "YukanZhang");
DateTime dt = DateTime.Now;
tokenManager.VerifyUserTokenValid("yukan", out dt);
tokenManager.AddToken("yang", "YangGe");
tokenManager.VerifyUserTokenValid("yukan", out dt);
// Test Constructor
TokenManager tm2 = new TokenManager(tokenManager);
tm2.VerifyUserTokenValid("yang", out dt);
tm2.VerifyUserTokenValid("yukan", out dt);
Thread.Sleep(20);
tokenManager.TokenManagerExit();
tm2.TokenManagerExit();
}