如何使用.net webservice直接向服务器插入和检索数据

 <WebMethod()> _
    Public Function UpdateProductDetail(ByVal ProductName As String, ByVal Remarks As String) As Integer
        Dim sSQl As String
        Dim pobjDas As New DBAccess
        sSQl = "INSERT INTO ProductDetail (ProducDetailId, productName, Remark) VALUES (NEWID(), '" & ProductName & "', '" & Remarks & "')"
        Return pobjDas.ExecuteSQL(sSQl)
    End Function
 <WebMethod()> _
    Public Function UpdateProd