Checkmark not saving state on round trip

[Mark B]

Even though I have EnableViewState set to true, CheckBox1 is not retaining
its value (false) on page reload.

I have an OnLoad page sub that queries a SQL table for the member's record.

I use Dim bolLoadedOnce As Boolean in the codebehind class for the page.

Then I use:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load

If bolLoadedOnce = True Then

Else
fLoadMemberSettings()
bolLoadedOnce = True
End If

End Sub

When I un-tick CheckBox1 it automatically fires a page reload which loads up
CheckBox1 as True again. I want it to remember that I un-ticked it.

 

[Eliyahu Goldin]

Get rid of bolLoadedOnce. It 1) doesn't survive postbacks and 2) already
provided by ASP.NET as IsPostBack property.

Use IsPostBack.

--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net

 

[Mark B]

Thanks.

That did it.

Get rid of bolLoadedOnce. It 1) doesn't survive postbacks and 2) already
provided by ASP.NET as IsPostBack property.

Use IsPostBack.

--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net

Even though I have EnableViewState set to true, CheckBox1 is not
retaining its value (false) on page reload.

I have an OnLoad page sub that queries a SQL table for the member's
record.

I use Dim bolLoadedOnce As Boolean in the codebehind class for the page.

Then I use:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load

If bolLoadedOnce = True Then

Else
fLoadMemberSettings()
bolLoadedOnce = True
End If

End Sub

When I un-tick CheckBox1 it automatically fires a page reload which loads
up CheckBox1 as True again. I want it to remember that I un-ticked it.

 

[Steven Cheng [MSFT]]

Hi Mark,

From your description and the code snippet you provided, you use a page
variable to hold the status of an operation, and you found that the value
is not persisted between page postback, correct?

In the code, I only see you access and set the "bolLoadedOnce" property,
but haven't seen you store this property into any storeage such as
ViewState or SessonState. By default, such an page variable will not be
persisted into page's ViewState automatically. If you need to maintain it
between postback, you'll need to store it manually, or directly access
page's ViewState to store/retrieve the value. e.g.

====================

If Page.ViewState("xxx") is Nothing Then
'do work
Page.ViewState("xxx") = "some value"

Else


End If
.......
================

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


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