Vb.Net - Asp.net Authentication Module Error

1 .I had created an asp.net Authentication  with SQL database also with Role enabled.the intranet application works fine in all authentication manner.
2.Then i wite the same application in vb.net windows stand alone module and tried to use the same form authentication for this application too. so make
all necessary steps accordingly , like web.config settings, and in visual studio , application properties,set my authenication service location as : http://localhost
also the same to role service location and web settings location. then i imported the followings :Imports System.Globalization Imports System.Threading Imports System.Web.ClientServices Imports System.Web.ClientServices.Providers Imports System.Web.Security
on my login page then in my login click event : i just try that login form worked or not.
 Dim msg As String = ""       & ...