User Control Button Click Event Not Raised

I have a User Control that has been added to the page dynamically. When I click a button on that user control:

1. The button_click event is NOT being raised
2. The page posts back
3. The user control is removed from the page

Here's the button-click event on my User Control:

 Protected Sub btnAddAttribute_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAddAttribute.Click
      Try
           Dim attrName As String = txtAddAttributeName.Text
           Dim attrValue As String = txtAddAttributeValue.Text

           'ADD ATTRIBUTE TO ATTRIBUTE TABLE
           putSQLData("INSERT INTO OD_Attribute_Values (AttributeName, AttributeValue) VALUES('" & attrValue & "', '" & attrName & "'")

           'ADD ATTRIBUTE TO PRODUCT DATA FOR THIS PRODUCT
           putSQLData("UPDATE OD_Product_Data SET VariantMapping = VariantMapping + ' | " & attrName & ":" & attrValue & "' WHERE SKU = '" & SelectedSKU & "'")

           'ADD NEW ctrlAttribute TO PARENT PLACEHOLDER AND SET VALUES
           Dim newAttr As New AttributeControl
           newAttr.AttributeName = attrName
           newAttr.AttributeValue = attrValue
           Page.Controls.AddAt(Page.FindControl("phAttributes").ClientID, newAttr)

           'REMOVE THIS CONTROL FROM PARENT PLACEHOLDER
           Me.Dispose()

      Catch ex As Exception
           Common.SendError(ex.Message, "AttributeControl.btnAddAttribute_Click")
      End Try
 End Sub

Here is the dynamic adding of controls:

 Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
      'WEB TAB
      getAttributes()
 End Sub

     Protected Sub getAttributes()
      Try
           Dim attr As String = ""
           Dim attrName As String = ""
           Dim attrValue As String = ""

           Dim ds As DataSet = getSQLData("SELECT VariantMapping FROM OD_Product_Data WHERE SKU='" & selectedSKU & "'")
           For Each dr As DataRow In ds.Tables(0).Rows()
                attr = dr(0).ToString
           Next
           ds = Nothing
           Dim attrArr As Array = attr.Split("|")
           For Each item As String In attrArr
                Dim attrDetail As Array = item.Split(":")
                attrName = attrDetail(0)
                attrValue = attrDetail(1)
                Dim ctrlAttributes As AttributeControl = LoadControl("ctrlAttribute.ascx")
                ctrlAttributes.AttributeName = attrName
                ctrlAttributes.Attrib开发者_JAVA百科uteValue = attrValue
                ctrlAttributes.ID = "ctrlAttribute-" & attrName
                phAttributes.Controls.Add(ctrlAttributes)
           Next
      Catch ex As Exception
           SendError(ex.Message, "Default.getAttributes")
      End Try
 End Sub

 Protected Sub btnAddAttribute_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAddAttribute.Click
      Dim ctrlAttributes As AttributeControl = LoadControl("ctrlAttribute.ascx")
      ctrlAttributes.ID = "ctrlAttribute" & phAttributes.Controls.Count + 1
      phAttributes.Controls.Add(ctrlAttributes)
 End Sub

 Protected Sub btnCreateAttribute_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnCreateAttribute.Click
      Dim ctrlAddAttribute As AddAttributeControl = LoadControl("ctrlAddAttribute.ascx")
      ctrlAddAttribute.SelectedSKU = selectedSKU
      ctrlAddAttribute.ID = "ctrlAddAttribute" & phAttributes.Controls.Count + 1
      phAttributes.Controls.Add(ctrlAddAttribute)
 End Sub

When adding controls dynamically to a page you must be certain to add the control to the page on each and every visit. It's a common mistake to add the dynamic control on the first visit but not on postbacks - this won't work! You need to add the dynamic controls to the control hierarchy on every visit.

Here are a couple of resources I recommend reading before working with dynamically-created controls:

• Dynamic Controls in ASP.NET
• Working with Dynamically Created Controls
• Truly Understanding Dynamic Controls
• Creating Dynamic Data User Interfaces
• Creating a Dynamic, Data-Driven User Interface

Happy Programming!

Neat workaround found here: http://www.justskins.com/forums/placeholder-child-of-child-49926.html.