i followed the program logic and I cant find the error that the debugger says that it is in the casting. I am following the example provided by Microsoft in
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconpassingservercontrolvaluesbetweenpages.asp
next, it is the code behind of both forms
1st webform
<---login.aspx---
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Public ReadOnly Property UserId() As String
Get
Return Trim(txtUser.Text)
End Get
End Property
Private Sub lnkLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lnkLogin.Click
Server.Transfer("secondForm.aspx")
end sub
<----secondForm.aspx---
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Public Class secondForm
Inherits System.Web.UI.Page
Public userLogin As login
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim blnAddinProgress As Boolean
Dim strUsername As String
If Not IsPostBack() Then
userLogin = CType(Context.Handler, login)
strUsername = userLogin.UserId
<-----
The error that i got from the debugger is "Specified cast is not valid."
following this message, Do i have to change the casting or is there another error or piece of code that i am forgetting.
thanks in advanceYou might try the similar technique documented in this topic:
Passing Values Between Web Forms Pages
HI! the link that you provided me is the one that i used.
If you see the structure of the code is pretty simmilar to the one of the link. Do you know about other option?
the error could be related to I am using Forms authentications?
thank you very much for your help
>HI! the link that you provided me is the one that i used.
Ok. The URL that you provided is not the same as the one for the other article, so I was a little confused.
Here's a question: what kind of control is lnkLogin in your login page? It should be a LinkButton or just Button (not a Hyperlink).
So, assuming that you're using a LinkButton, the bad news is that I cannot reproduce your error. I had to add a line (which you probably have). This is what my target page code looks like:
Public userLogin As login
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
Dim blnAddinProgress As Boolean
Dim strUsername As String
If Not IsPostBack() Then
userLogin = CType(Context.Handler, login)
strUsername = userLogin.UserId
Response.Write(strUsername)
End If
End Sub
