Hi -
I am developing a composite control using VB.NET.
In the ASP.NET page using the control, How can I update a label text value
to reflect the value of a property of the custom control whenever the
composite control is changed? The label is not a part of the custom
control.
I've managed to correctly set the composite control properties whenever it
is changed, but I don't know how or where to update the label.
What am I doing wrong?
My code is below. Thanks for your help.
- Jeff
<DefaultPropert y("SelectedValu e"), ToolboxData("<{ 0}:MyControl
runat=server></{0}:MyControl>" )> Public Class MyControl
Inherits System.Web.UI.W ebControls.WebC ontrol
Implements INamingContaine r
Dim WithEvents ddlMyControl as New DropDownList
Dim sSelectedValue as String
<Bindable(True) , Category("Data" ), DefaultValue("A ")> Property
[SelectedValue]() As String
Get
Return sSelectedValue
End Get
Set(ByVal Value As String)
EnsureChildCont rols()
sSelectedValue = Value
End Set
End Property
Protected Overrides Sub CreateChildCont rols()
popItems()
Controls.Add(dd lMyControl)
ddlMyControl.Au toPostBack = True
End Sub
Private Sub popItems()
Dim iItem as ListItem
iItem = New ListItem
iItem.Value = "A"
iItem.Text = "A Alpha"
ddlMyControl.It ems.Add(iItem)
iItem = New ListItem
iItem.Value = "B"
iItem.Text = "B Bravo"
ddlMyControl.It ems.Add(iItem)
iItem = New ListItem
iItem.Value = "C"
iItem.Text = "C Charlie"
ddlMyControl.It ems.Add(iItem)
End Sub
Public Sub ControlChanged( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles ddlMyControl.Se lectedIndexChan ged
SelectedValue = ddlMyControl.Se lectedValue
End Sub
End Class
In the aspx page:
<%@Register TagPrefix="enp" Namespace="eNPC ontrols2" Assembly="eNPCo ntrols2"
%>
....
<enp:eNPMyContr ol id=ENPMyControl 1 runat="server">
</enp:eNPMyContro l>
<asp:Label id=lblCtrl runat="server" Text="<%=eNPMyC ontrol.Selected Value%>">
</asp:Label>
