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asp:Image control in a DataList ItemDataBound event

Posted on 2005-05-08
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Last Modified: 2008-03-17
I have " <asp:Image ID="imgEng" Visible=False . .> " in a DataList

I'm trying to reference it so I can set it's visible to True but can't.
This is not working,  "Image" is a problem.  in ItemDataBound event:

   Dim imgEng As Image  << not valid
   imgEng = e.Item.Cells(3).FindControl("imgEng")
   imgEng.Visible = True

Tried this but got the same problem:

   Dim imgEngAs Image = CType(e.Item.Cells(3).FindControl("imgEng"), Image)

But controls like this work:

         Dim lnkAdd As LinkButton
         lnkAdd = e.Item.Cells(3).FindControl("lnkAdd")
         lnkAdd.Visible = True

How is a asp:Image control referenced in a DataList?
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Question by:MikeMCSD
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7 Comments
 
LVL 23

Expert Comment

by:b1xml2
ID: 13954817
Public Sub DataList1_ItemDataBound(ByVal sender As Object, ByVal e As DataListItemEventArgs)
      Select Case e.Item.ItemType
      Case ListItemType.Item, ListItemType.AlternatingItem
            Dim imgEng As Image = DirectCast(e.Item.FindControl("imgEng"),Image)
      End Select
End Sub

<asp:DataList Id="DataLust1" RunAt="Server" OnItemDataBound="DataList1_ItemDataBound">

</asp:DataList>
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LVL 16

Author Comment

by:MikeMCSD
ID: 13954841
Tried this but same problem:
Dim imgEng As Image = DirectCast(e.Item.Cells(3).FindControl("imgEng"), Image)
0
 
LVL 23

Expert Comment

by:b1xml2
ID: 13954852
there's a slight difference:
Dim imgEng As Image = DirectCast(e.Item.FindControl("imgEng"),Image)

The CellCollection starts at 0. So the first column is e.Item.Cells(0) .. and so on and so forth. To avoid worrying about which cell the control is in, use e.Item.FindControl(..)

HTH
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LVL 16

Author Comment

by:MikeMCSD
ID: 13954873
This is the problem:
Dim imgEng As Image   <<< it won't let me declare it . .  look at it in VS.
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LVL 23

Accepted Solution

by:
b1xml2 earned 2000 total points
ID: 13954881
ahhh it may be because there is the namespace System.Drawing and System.Web.UI.WebControls clashing!!

Dim imgEng As System.Web.UI.WebControls.Image = DirectCast(e.Item.FindControl("imgEng"),System.Web.UI.WebControls.Image)

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LVL 23

Expert Comment

by:b1xml2
ID: 13954891
where System.Drawing and System.Web.UI.WebControls are referenced within the same class, there will be a clash with the class Image (both namespaces have their respective Image class)

In intellisense inside C#, the red error icon appears when you try to type Image. This apparently is not available in the VB.NET IDE... very strange
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LVL 16

Author Comment

by:MikeMCSD
ID: 13954908
very good, yes b1, it looks like that is the problem . . but why did they name the control
for asp:Image with namespace Image?  To drive me crazy of course.

I came up with another idea/solution in the meantime that also worked:

<asp:Image ID="imgEng" Visible='<%# DataBinder.Eval(Container, "DataItem.Engraving")%>'  . . .   the field is a bit field.

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