I am currently working with a user control - it is functioning as designed. I am trying to add an image button to it, and I am getting the error, "Object reference not set to an instance of an object".

I am using VS.NET, and made sure that the line was included in the codebehind.

This User Control's main purpose is to house a datalist. What I am trying to do is put an Image Button in the header template, so that I can set it's imageURL property dynamically. Is there a conflict wherein I can't place another control into a datalist?

Thanks in advance
Colonel

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In God we trust, everything else we test.

Update: The forms designer tells me that a component already has the name "imbHeader". This is not the case.

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In God we trust, everything else we test.

When you place controls within a control like a datalist, you often have to handle things a bit differently.

In the page code, you need to create a handler for the DataList.ItemCreated event. ItemCreated fires after each row item of the datalist is created so you need to test for the appropriate datalist item. Then you can search for and cast the image button control and set the ImageUrl property on it.

Private Sub oDataList_ItemCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataListItemEventArgs) Handles oDataList.ItemCreated
    If e.Item.ItemType = ListItemType.Header Then
        CType(e.Item.FindControl("imbHeader"), ImageButton).ImageUrl = "..."
    End If
End Sub

Peter
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Work smarter, not harder.