Variable Scope / Visibility / Caching Problem

[Steve Wark]

If I create two aspx pages, place three text boxes (working with VS .net
2003 and web form controls) and a button on both forms.

On the first page, the button is set to use the "onClick" to open the second
page using Window.Open with the values being passed to the second page by a
global variable created in a Module added to the project, by the use of an
Application variable and by the use of a session variable.

In the page load of the second form the values of the text boxes are set to
these passed values.

When I run this as a single instance all works fine. If from another
machine I now open this web site, while still having the first instance open
then the data displayed on the second page reflects the first instances data
for the global variable and the application variable, the session variables
data is blank. If I right click and perform a refresh the data become
correct.

I assume this must be something to do with caching.

Can anyone advise?

Steve Wark
First Pages Page_Load & Button Click
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

Response.Expires = -1

Button1.Attributes.Add("onClick",
"window.open('webform2.aspx','Title','width=950,he ight=610,left=100,top=100')")

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

v1 = TextBox1.Text

Application("v2") = TextBox2.Text

Session("v3") = TextBox3.Text

End Sub
Second Pages Page_Load
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

Response.Expires = -1

Button1.Attributes.Add("onClick", "window.close()")

TextBox1.Text = v1

TextBox2.Text = Application("v2")

TextBox3.Text = Session("v3")

End Sub

[Brock Allen]

This approach won't work in a multi-user scenario. The variables you put
into the module are in fact global for all users of your ASP.NET web application.
You should look into using something like Session state to maintain per-user
data. Here's a list of state management options (including Session):

http://msdn.microsoft.com/library/de...asp?frame=true

-Brock
DevelopMentor
http://staff.develop.com/ballen

If I create two aspx pages, place three text boxes (working with VS
.net 2003 and web form controls) and a button on both forms.

On the first page, the button is set to use the "onClick" to open the
second page using Window.Open with the values being passed to the
second page by a global variable created in a Module added to the
project, by the use of an Application variable and by the use of a
session variable.

In the page load of the second form the values of the text boxes are
set to these passed values.

When I run this as a single instance all works fine. If from another
machine I now open this web site, while still having the first
instance open then the data displayed on the second page reflects the
first instances data for the global variable and the application
variable, the session variables data is blank. If I right click and
perform a refresh the data become correct.

I assume this must be something to do with caching.

Can anyone advise?

Steve Wark

First Pages Page_Load & Button Click
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Response.Expires = -1

Button1.Attributes.Add("onClick",
"window.open('webform2.aspx','Title','width=950,he ight=610,left=100,to
p=100')")
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

v1 = TextBox1.Text

Application("v2") = TextBox2.Text

Session("v3") = TextBox3.Text

End Sub

Second Pages Page_Load
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Response.Expires = -1

Button1.Attributes.Add("onClick", "window.close()")

TextBox1.Text = v1

TextBox2.Text = Application("v2")

TextBox3.Text = Session("v3")

End Sub