Link image with session

Question

Hi 

I have nave user on the header that should show the image of the user after he login but i dont know how i can show the user image depending on session  

<asp:Placeholder ID="loggedview" runat="server">

<div class="loggedinview">

<asp:Image ID="Image4" runat="server" Text='<%# Eval("Img") %>' CssClass="loggeduserimg" />

 

</div>

</asp:Placeholder>