I am getting the following error
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
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Its too late but i would like to answer it in my way, what i used to achieve it:
<%# Eval("Message").toString()== HttpContext.Current.Profile.UserName)?" " :""%>
Now this will only show image button if Message is equal to username.
This might help any one else in same situation.
In my situation i needed to check null and empty string...so i implemented like this below:
<%# Eval("DateString")!= null && Eval("DateString")!= ""? ""+Eval("DateString") + "":"" %>
Thanks