Update Item attribute in sharepoint using web services

Question

I got this code in VB. and it doesn't do anything.Can anyone help me under stand why and give me a solution?

Dim updatestr As String = "<Method ID='1' Cmd='Update'>" + _
            "<Field Name='Title'>Ficha_router</Field>" + _
            "<Field Name='ID_Cliente'>0000</Field>" + _
            "</Method>"


            Dim xmlDoc = New System.Xml.XmlDocument()

            Dim elBatch As System.Xml.XmlElement = xmlDoc.CreateElement("Batch")

            elBatch.SetAttribute("OnError", "Continue")
            elBatch.SetAttribute("ListVersion", "1")
            elBatch.SetAttribute("ViewName", "")

            elBatch.InnerXml = updatestr

            listService.UpdateListItems("Flecha", elBatch)

Answer 1

You may need to add <Field Name='ID'>9</Field> in order for the webservice to determine which item requires updating.

http://msdn.microsoft.com/en-us/library/cc404818.aspx

Answer 2

I've solved it.

I'm retrieving the item "ID" field thru the web service, and then I update it. I just thought that the updatelistitems could find my file without me knowing the ID.

Thanks anyway.