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POInteraction between two user controls
 

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    <p>I'm on the verge of madness ...</p> <p>In the application I'm actually building, I'm dealing with two dynamically-added controls that need to interact with each other, but I've reduced the problem to an as-simple-as-I-can-make-it example with the controls being statically loaded, and it still presents the same problem: a NullReferenceException when invoking the delegate. Here's the gist:</p> <p><strong>Control 1</strong></p> <pre><code>Partial Class Control1 Inherits System.Web.UI.UserControl Private _delClicked As System.Delegate Public WriteOnly Property UpdateLabel() As System.Delegate Set(ByVal value As System.Delegate) _delClicked = value End Set End Property Protected Sub btnButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnButton.Click Dim aObj(0) As Object aObj(0) = 1 _delClicked.DynamicInvoke(aObj) End Sub End Class </code></pre> <p><strong>Control 2</strong></p> <pre><code>Partial Class Control2 Inherits System.Web.UI.UserControl Protected WithEvents Control1 As New Control1 Delegate Sub ChangeLabel(ByVal int As Integer) Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init Dim delChangeLabel As New ChangeLabel(AddressOf UpdateLabel) Me.Control1.UpdateLabel = delChangeLabel End Sub Private Sub UpdateLabel(ByVal int As Integer) lblLabel.Text = "Value is now " &amp; int End Sub End Class </code></pre> <p>If I put a breakpoint on the line of Control2 where the Control1 delegate is assigned, I can step through and watch it get set in the Control1 object. However, when the btnButton_Click event fires, the value of _delClicked has gone back to Nothing.</p> <p>Any help would be greatly appreciated. Thanks!</p>
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