<asp:Image ID="img_user_pic" width='66' height='80' alt='User name' class='user-icon' runat="server"/>
<asp:image id="img_user_pic" width="66" height="80" alt="User name" class="user-icon" runat="server" onerror="this.onload = null; this.src='ImageurlORAnyImageHere.jpg';" />
src="/Images/test.jpg" <asp:image id="img_user_pic" width="66" height="80" alt="User name" class="user-icon" runat="server" src="/Images/test.jpg" xmlns:asp="#unknown" />
var
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