Mailto link in a GridView with email address from database

I am try to display email address in a GridView that can be click to send
email. I created a TempleteField:

<asp:TemplateField headertext="Email">
<ItemTemplate>
<a href='<%#DataBinder.Eval(Container,
"DataItem.EmailAddress")%>' >
</ItemTemplate>
</asp:TemplateField>

The GridView displays all the fields from the database but not the email
address as a link.