Trying to get some byte array from a helper function in to an attribute

Question

I am trying to get some binary data in to the "DataValue" attribute as in the below control.

<telerik:RadBinaryImage runat="server" ID="RadBinaryImage1" AutoAdjustImageControlSize="false" 
  DataValue='<%# getBinary(); %>' />

the DataValue field accepts a byte[] .

my code behind looks like this

public byte[] getBinary()
{
    TestDBDataContext db = new TestDBDataContext();

    var r = (from a in db.ImageTables where a.Id == 22 select a).FirstOrDefault();

    byte[] bt = r.Thumbnail.ToArray();

    return bt;    
}

NOTE: The control is inside a repeater control

How could I get byte array in to the DataValue attribute on the above control ?

Answer 1

The error message and your markup are not consistent: in your markup you use data binding syntax <%# ... %> (with the # at the beginning) but the error message reports a code block <% ... %>.

Using a code block inside a control attribute is not valid ASP.NET, the text is interpreted literally, and thus is not recognized as a byte array. Make sure you use data binding syntax, can you double check?