Parameter not passing on Delete

Interesting problem, selecting and updating (with reference to a Form View) works great. Whenever I try to delete I get this error:

Must declare the variable '@.template_id'.

Description: Anunhandled exception occurred during the execution of the current webrequest. Please review the stack trace for more information about theerror and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Must declare the variable '@.template_id'.

Here is my code:

<asp:SqlDataSource ID="SqlTemplateDS" runat="server"
SelectCommand="SELECT [template_id], [client_id], [language], [label], [email_default], [email_template], [event_template] FROM [CMT] ORDER BY [template_id]"
DeleteCommand="DELETE FROM CMT WHERE (template_id = @.template_id)"
ConnectionString="<%$ ConnectionStrings:BrandMSConnectionString %>">
</asp:SqlDataSource
<asp:GridView ID="grdTemplates" runat="server" AutoGenerateColumns="False"
DataKeyNames="template_id"
DataSourceID="SqlTemplateDS"
Font-Names="Verdana"
Font-Size="Small"
ForeColor="Black"
Width="100%"
OnSelectedIndexChanged="grdTemplates_SelectedIndexChanged"
CellPadding="2">
<Columns>
<asp:BoundField DataField="template_id" HeaderText="ID" ReadOnly="True" SortExpression="template_id" />
<asp:BoundField DataField="client_id" HeaderText="Client" SortExpression="client_id" />
<asp:BoundField DataField="language" HeaderText="Language" SortExpression="language" />
<asp:BoundField DataField="label" HeaderText="Label" SortExpression="label" />
<asp:CheckBoxField DataField="email_default" HeaderText="Default" SortExpression="email_default" />
<asp:CheckBoxField DataField="email_template" HeaderText="Email" SortExpression="email_template" />
<asp:CheckBoxField DataField="event_template" HeaderText="Event" SortExpression="event_template" />
<asp:TemplateField HeaderText="Options">
<ItemTemplate>
<asp:LinkButton ID="btnModify" CommandName="Select" runat="server" ForeColor="Blue">Edit</asp:LinkButton> |
<asp:LinkButton ID="btnDelete" CommandName="Delete" runat="server" ForeColor="Blue">Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle BackColor="Khaki" />
<AlternatingRowStyle BackColor="Beige" />
</asp:GridView>

Any ideas?

ChrisI solved the problem by using the "original_" prefix in front sql variable so it reads:

DeleteCommand="DELETE FROM CMT WHERE (template_id = @.original_template_id)"

I think its pretty poor that there wasn't better documentation regarding this issue. Apparently ifany of the items in DataKeyNames areshown in a databound column, updating and deleting actions need to specificy whick key value to use. In this case using the prefix "original_" signals to the control which parameter value to use.

I hope this helps anyone who is having similar problems in the future.