您只想将值存储到Session中。在您的登录代码中，在您确认他们是有效用户后，您可以执行以下操作：

You just want to store the value into the Session. In your login code, after you have verified they are a valid user you can do something like:

Session["EmailAddress"] = emailAdress;

然后您可以通过以下方式轻松使用它：

And then you can use it later on easily by:

lblEmailAddress.Text = Session["EmailAddress"];