除非你真的非常需要，否则不要使用静态。

  object  userID = HttpContext.Current.Session [  UserID 跨度>]; 

please can somebody help with how to get the username of authenticated user in asp.net from my static class so that I can query my database that non membership provider one so dat I can fetch additional information about such user from my database. Thanks

By preference, don't use static unless you really, really have to.

But, if you have to: store the Authenticated user id in the Session as usual, then in your static method use the static context:

object userID = HttpContext.Current.Session["UserID"];