HyperLinkField mailto

If you are trying to use the HyperLinkField mailto function then you will most like encounter a problem unless you have set it up correctly to fixed.

Here I try to use the HyperLinkField but it does work as expected:

<asp:GridView ID="GridView5" runat="server" AutoGenerateColumns="False" CssClass="DataTableProjects"
                                DataSourceID="SqlDataSourceBIcontacts" GridLines="None" ShowHeader="False">
   <Columns>
        <asp:BoundField DataField="Location" HeaderText="Location" SortExpression="Location" />
        <asp:HyperLinkField DataNavigateUrlFields="RTCFlink" DataTextField="Name" HeaderText="Name" />
   </Columns>
   <AlternatingRowStyle CssClass="SearchResultsAlternateCell" />
</asp:GridView>
 
To get around this issue you can try the following thing, instead of using the HyperLinkField try to use the BoundField.
 
<asp:BoundField DataField="SendTo" DataFormatString="<a href=mailto:{0}>{0}</a>"
    HtmlEncodeFormatString="false" HeaderText="Email" SortExpression="SendTo" />