User control losing state after postback

Eli20 · Apr 21, 2005

hi, i have a web user control with some properties, all the properties are set when clicking on a button thats part of the control.
However, when i try to get the value of the properties in my main page, they are null.

i set the eneable view state of my control to true, and the textboxes and labels work fine, but im losing the properties.
can somebody tell me how can i fix it?

thank you very much

Eli

RTomes · Apr 21, 2005

YOUR ASPX FILE:
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="Examples.WebForm1"%>
<%@ Register TagPrefix="uc1" TagName="MyControl" Src="MyControl.ascx" %>
<HTML>
<body>
<form runat="server">
<uc1:MyControl id="MyControl1" MyText="Hello" runat="server" />
</form>
</body>
</HTML>

YOUR CODE BEHIND:
Public Class WebForm1
Inherits System.Web.UI.Page

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub

'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object

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.
InitializeComponent()
End Sub

#End Region
Protected WithEvents MyControl1 As MyControl
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
MyControl1.MyText = MyControl1.MyText & " Again"
End Sub

End Class

YOUR USER CONTROL ASCX:
<%@ Control Language="vb" AutoEventWireup="false" Codebehind="MyControl.ascx.vb" Inherits="Examples.MyControl" %>
<asp:Label ID="Label1" Runat="server" />

YOUR USER CONTROL CODE BEHIND:
Public Class MyControl
Inherits System.Web.UI.UserControl

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub
Protected WithEvents Label1 As System.Web.UI.WebControls.Label

'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object

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.
InitializeComponent()
End Sub

#End Region

Private _MyText As String
Public Property MyText() As String
Get
Return _MyText
End Get
Set(ByVal Value As String)
_MyText = Value
End Set
End Property
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Label1.Text = _MyText
End Sub

End Class

RTomes · Apr 21, 2005

Maintains State even when you alter it like this:

ASCX CONTROL:
If Not Page.IsPostBack Then
Label1.Text = _MyText
End If

ASPX PAGE:
If Not Page.IsPostBack Then
MyControl1.MyText = MyControl1.MyText & " Again"
End If

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User control losing state after postback

Eli20

Programmer

RTomes

Programmer

RTomes

Programmer

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