I think you need to give value for
id
in
Updateparameters
<updateparameters>
<asp:parameter name="subtype" type="string" />
<asp:parameter name="id" type="string" />
</updateparameters>
EDIT
------------------------
You need to add another parameter value for Update command because there are two parameters
@subtype
and
@id
. So add the below line inside the
Updateparameters
<asp:parameter name="id" type="string" />