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copied!<p>In response to your second update,</p> <p>I had this exact problem, and I believe it has to do with the fact that you are adding a dynamic control to your page inside of the UpdatePanel.</p> <p>There may be a better way to do it out there, as I am certainly no ASP.NET expert, but I was able to solve this problem on my own by adding the control in a div that was hidden using CSS -before- it was needed, and then auto-incrementing the "dummy" control's ID so there are no conflicts, and I can keep adding as many as I want. That way, when the UpdatePanel is triggered it fully recognizes the controls and their contents, excepting the hidden ones of course.</p> <p>I am using XSL to transform my XML into a dynamic page that includes ASP.NET controls, so essentially I did the following:</p> <pre><code><div class="hide"> <asp:FileUpload CssClass="upload" identity="addVersion_{@id}_{count(draft) + 1}" runat="server" /> <asp:Button Text="Add File" identity="addVersionBtn_{@id}_{count(draft) + 1}" fileControlIdentity="addVersion_{@id}_{count(draft) + 1}" action="addVersion" runat="server" /> </div> </code></pre> <hr> <p>And then in the code-behind:</p> <pre><code>Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init //Code to generate the data (stripped out because it is generated in a different manner than the original poster) //Add events for all of the new-found controls depending on their type recursiveAddEvents(nameOfPlaceHolder.Controls) End Sub //Add events for all of the new-found controls depending on their type Sub recursiveAddEvents(ByRef controls As ControlCollection) For Each con As Control In controls If con.Controls.Count > 0 Then recursiveAddEvents(con.Controls) End If //Try to cast the control to different data types Dim btn As Button = TryCast(con, Button) Dim file As FileUpload = TryCast(con, FileUpload) //Test to see which type the control was and apply the actions to it If Not btn Is Nothing Then //Assign the correct click events If btn.Attributes.Item("action") = "addVersion" Then AddHandler btn.Click, AddressOf addDraftVersion btn.ID = btn.Attributes.Item("identity") //Register the control with the ScriptManager ScriptManager.GetCurrent(Page).RegisterPostBackControl(btn) End If ElseIf Not file Is Nothing Then //Assign the correct click events file.ID = file.Attributes.Item("identity") End If Next End Sub Protected Sub addDraftVersion(ByVal sender As Button, ByVal e As EventArgs) Dim fileName as String = sender.Attributes("title").Replace(" ", "_") & "_D" & info("draftID") & "_V" & info("versionID") Dim inputControl As FileUpload = TryCast(trackPH.FindControl(sender.Attributes("fileControlIdentity")), FileUpload) If inputControl Is Nothing Then Exit Sub End If //Do whatever need to be done //Trigger UpdatePanel(s) nameOfUpdatePanel.Update() End Sub </code></pre> <hr> <p>I stripped out a lot of the code, but it should still get the general idea across :)</p>

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