click the button twice ?

[Borry]

Hello everybody,


Can anyone please explain me a solution or workaround for my following problem ?

When I want to pass a session variable with a postback, then I always need to click the button twice !

Here's my code :

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: This method call is required by the Web Form Designer
        'Do not modify it using the code editor.
 
        Response.Write(Session("myTest"))
        InitializeComponent()
    End Sub
 
#End Region
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Session("myTest") = "testing"
    End Sub

There's only one button on the page, nothing else ! I need to click twice the button before I can see testing ...
(it's with a postback)

I really don't know anymore how I can solve this !

Thanks in advance,

Bjorn

[Lord_Rat]

Make sure that the following are true:

In your @Page directive, autoeventwireup is false and that also, your button is autopostback=true.

[Lord_Rat]

One more thing:

Page load ALWAYS executes before any event handlers do. Therefore, if you are having a problem because you do not see your message onscreen until the second click, it's not a problem with clicking twice. It's because you are response.writing before you set the variable.

Page Loads first time:

Page Load executes, no session exists, blank output

Button is clicked:

Page Load executes, no session exists, blank output
Button Event Handler executes, session created, but not outputted since the PageLoad already executed before this step.

Button clicked again:

Page Load executes. Session exists this time, is outputted.
Button Event Handler executes again, session variable recreated.


You should make an ASP:Label and in both, the page load and the button event handler, change the .text property to reflect the value of that session variable.

[Borry]

Hello Lord !

Thanks a lot ! Right now I understand why it didn't execute correctly and I also know a workaround now !

Thanks !

Originally posted by Lord_Rat
One more thing:

Page load ALWAYS executes before any event handlers do. Therefore, if you are having a problem because you do not see your message onscreen until the second click, it's not a problem with clicking twice. It's because you are response.writing before you set the variable.

Page Loads first time:

Page Load executes, no session exists, blank output

Button is clicked:

Page Load executes, no session exists, blank output
Button Event Handler executes, session created, but not outputted since the PageLoad already executed before this step.

Button clicked again:

Page Load executes. Session exists this time, is outputted.
Button Event Handler executes again, session variable recreated.


You should make an ASP:Label and in both, the page load and the button event handler, change the .text property to reflect the value of that session variable.

[hellswraith]

That is funny. I was having the exact same problem with a part of my code. The funny thing is, I knew the order of events, and I still messed it up...lol. Thanks for the refresh...I needed it.

[Borry]

I knew them too but I couldn't think about that first click that first the page loads and then you execute the click event....

But whatever ... I'm 26 and still got a long way to go ! (If Microsoft doesn't go tooooo fast )

Originally posted by hellswraith
That is funny. I was having the exact same problem with a part of my code. The funny thing is, I knew the order of events, and I still messed it up...lol. Thanks for the refresh...I needed it.