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Bind DataValue From Codebehind?

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BinaryImage
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Robert
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Robert asked on 22 Jul 2010, 02:54 PM
I have a radbinaryimage in a listview and on Radlistview1.ItemDataBound I am trying to set the DataValue to another field from my sql Query based on whether the record is "Signed" How can I do this it keeps giving me errors.

Protected Sub RadListView2_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadListViewItemEventArgs) Handles RadListView2.ItemDataBound
       If TypeOf e.Item Is RadListViewDataItem Then
           Dim signed As Label = DirectCast(e.Item.FindControl("Label6"), Label)
           Dim pnl1 As Panel = DirectCast(e.Item.FindControl("TopPanel"), Panel)
           Dim lbl4 As Label = DirectCast(e.Item.FindControl("Label4"), Label)
           Dim pnl2 As Panel = DirectCast(e.Item.FindControl("BottomPanel"), Panel)
           Dim btn1 As Button = DirectCast(e.Item.FindControl("Button1"), Button)
           Dim menu2 As RadMenu = DirectCast(sender.findcontrol("RadMenu2"), RadMenu)
           Dim img As RadBinaryImage = DirectCast(e.Item.FindControl("RadBinaryImage4"), RadBinaryImage)
           'Dim fball As menu2.
             
           'signed.Text = "True" 'Then
           'DirectCast(e.Item.FindControl("Div1"))
           'Div1.backgroundcolor = "00CC99"
       End If
         
       If Session("Signed") = 1 Then
           Dim menu2 As RadMenu = DirectCast(sender.findcontrol("RadMenu2"), RadMenu)
           Dim fball As RadMenuItem = DirectCast(menu2.FindItemByText("QuickFax (Signed)"), RadMenuItem)
           Dim fbsigned As RadMenuItem = DirectCast(menu2.FindItemByText("QuickFax (ALL)"), RadMenuItem)
           Dim img As RadBinaryImage = DirectCast(e.Item.FindControl("RadBinaryImage4"), RadBinaryImage)
           img.DataValue =<%# Bind("SignedImage") %>
           fball.Visible = True
           fbsigned.Visible = True
       End If

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Rosen
Telerik team
answered on 22 Jul 2010, 05:01 PM
Robert,

You cannot use binding expression in code-behind.
In order to populate the RadBinaryImage control you should assign the value of the field which holds the byte array directly to the DataValue property. Similar to the following:

img.DataValue = CType(DataBinder.Eval(CType(e.Item, RadListViewDataItem).DataItem, "SignedImage"), Byte())

All the best,
Rosen
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Robert
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answered on 26 Jul 2010, 04:19 PM
Thanks for the info however I used a case statement in my sql query to achieve what I needed. One question though COuld you give me an example of how I would set the imageurl of this control to come directly from the SQL Server. IE I have the image stored in my sql db an I would like to stream directly from the db and set the imageurl to be from the streamed SQL image.
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Rosen
Telerik team
answered on 28 Jul 2010, 01:27 PM
Hello Robert,

As I have mentioned in my previous message, in order to use RadBinaryImage control you should first retrieve the image save in the DB as a byte array and then assign it to DataValue property of the control.
You may refer to this online demo.

Greetings,
Rosen
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