User control property is blank

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Chris McFarling - 21 Sep 2007 00:14 GMT

I'm trying to programatically set a private member variable within a user
control. In this case in the user control's Page_Load event, I set
m_PageTitle to equal "xxx". When I try to retieve that value from the
hosting page via a Get accessor (NavMenu1.PageTitle), the value is empty. Is
there anything wrong with this code?

control.ascx---------------------------------------------------
<%@ Control Language="VB" ClassName="navigation" %>
<script runat="server">
Private m_PageTitle as String
Public Property PageTitle As String
Get
Return m_PageTitle
End Get
Set
m_PageTitle = Value
End Set
End Property

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
m_PageTitle = "xxx"
End Sub
</script>

page.aspx-----------------------------------------------------------
<%@ Register TagPrefix="PP" TagName="NavMenu" Src="~/control.ascx" %>

<html>
<body>
<script runat="server">

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
Response.Write(NavMenu1.PageTitle)
End Sub

</script>

<PP:NavMenu id="NavMenu1" runat="server" />
</body>
</html>

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Just Me - 21 Sep 2007 00:22 GMT

The most likely cause is that you lost your variable during postback. You
need to persist the member variable using viewstate.

If you click a button on the web page, you will loose whatever private
member variables you have unless you store them. You can restore them on the
load event for the control and set the viewstate when you set the Property
of of the control.

'//On_Load
If Postback then

myVariableName = Ctype(viewstate("m_PageTitle"), string)

End If

'//Modified Property
Private m_PageTitle as String
Public Property PageTitle As String
Get
Return m_PageTitle
End Get
Set
m_PageTitle = Value
viewstate( "MyVariableName") = m_PageTitle
End Set
End Property

HTH

> I'm trying to programatically set a private member variable within a user
> control. In this case in the user control's Page_Load event, I set
[quoted text clipped - 36 lines]
> </body>
> </html>

Reply to this Message

bruce barker - 21 Sep 2007 00:32 GMT

probably the page_load's are not running in the order you expect.

-- bruce (sqlwork.com)

> I'm trying to programatically set a private member variable within a user
> control. In this case in the user control's Page_Load event, I set
[quoted text clipped - 36 lines]
> </body>
> </html>

Reply to this Message

Chris McFarling - 21 Sep 2007 00:43 GMT

Ahhhh, that is it. Using Page_LoadComplete() in the .aspx file solves it.

> probably the page_load's are not running in the order you expect.
>
[quoted text clipped - 40 lines]
>> </body>
>> </html>

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User control property is blank

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