Can you tell me how to define the token with desire format?

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C#

Hi,
I am creating the web service authentication. When the user login with user name and password. Web server will give the token to the client to request the web service with that token. I would like to define the token with that format (randomcode+UserID+dateformat(yyyy-mm-dd)+randomcode). Can you tell me how to define that format with example. Following is my code for token.

string token = Guid.NewGuid().ToString();

HttpRuntime.Cache.Add(token, Username, null,

System.Web.Caching.Cache.NoAbsoluteExpiration,

TimeSpan.FromMinutes(60),

System.Web.Caching.CacheItemPriority.NotRemovable,

null);

Best Regards,
Wai Mar Khaing