Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control

by

The syntax is 

<%# Eval("...") %>

You could do something like 

<asp:ImageButton Visible="<%# ShowImg(Eval(Container.DataItem,"Message")) %>" />

and in your codebehind:

boolean ShowImg(string msg)
{
     return (msg == HttpContext.Current.Profile.UserName);
}

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