Here is the entire class file:
Imports Microsoft.VisualBasic
Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web
Imports System.Web.HttpApplication
Imports System.Web.HttpApplicationState
Imports System.Web.HttpBrowserCapabilities
Imports System.Web.HttpContext.Current.Session
Imports System.Web.HttpRequest
Imports System.Web.HttpResponse
Namespace CheckSession
Public Class CheckSession
Inherits System.ComponentModel.Component
Public Sub CheckUserSession()
If Session("UserID"

= "" Then
Response.Redirect(""

End If
End Sub
End Class
End Namespace
It doens't like Imports System.Web.HttpContext.Current.Session.
Thanks.