Galhano //127.0.0.1

Concatenate data fields as binding expression:

<asp:label id="Label1" runat="server" 
     text='<%# String.Format("{0}, {1}", Eval("ContactLastName"), Eval("ContactFirstName")) %>'>
</asp:label> 

how to implemented mailto in Hyperlink asp control inside the gridview:

<asp:HyperLink id="hl1" runat="server" 
   NavigateUrl='<%# Eval("Email" , "mailto:{0}") %>'
   Text='<%# Eval("Email") %>'>
</asp:HyperLink>