如何重建VS2010 IDE Intellisense?

有些正在工作，有些没有工作.

some are working some are not working.

例如，

我做了

using System.Web.Security;

MembershipUser myObject = Membership.GetUser();
        string UserID = myObject.ProviderUserKey.ToString();
        Response.Write(UserID);

membershipuser不会以绿色突出显示.和System.Web.没有列出对象

the membershipuser is not highlighted in green. and System.Web. is not listing objects

但是代码运行正常.如何使智能感知正常?

but the code is working fine though. How do I make the intellisense work fine?