Delete confirmtion getting error

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Decimal' for method 'System.Web.Mvc.ActionResult Delete(System.Decimal)' in 'HasBroRMSApplication.Controllers.CommentTemplateController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters

mycode

@Html.ActionLink("Delete", "Delete", "CommentTemplate", new { id = @item.CommentTemplateID, onclick = "submitTest()" })

Updating Data

Are you sure to delete?

function submitTest() {

$("#mdlAlertmsg").modal('show');

alert('test');

}