VB deserialise DataSet from C# XML

Question

The following Code throws an XML deserialisation error (20,2) and i don't know why. Is there somethign special with XmlSerialiser to know for deserialisation of DataSets?

Dim strStringReader As StringReader = New StringReader(strValue)
Dim oXS As XmlSerializer = New XmlSerializer(strObjectType)
Deserialize = oXS.Deserialize(strStringReader)

this is the xml (available in a string strValue):

<?xml version='1.0' encoding='utf-16'?>
<DataTable>
<xs:schema id='DocumentElement' xmlns='' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:msdata='urn:schemas-microsoft-com:xml-msdata'>
  <xs:element name='DocumentElement' msdata:IsDataSet='true' msdata:UseCurrentLocale='true'>
    <xs:complexType>
      <xs:choice minOccurs='0' maxOccurs='unbounded'>
        <xs:element name='tblCategoryLanguageElements'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='_LE_LanguageID' type='xs:string' minOccurs='0' />
              <xs:element name='_LE_FieldID' type='xs:string' minOccurs='0' />
              <xs:element name='_LE_Value' type='xs:string' minOccurs='0' />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>
<diffgr:diffgram xmlns:msdata='urn:schemas-microsoft-com:xml-msdata' xmlns:diffgr='urn:schemas-microsoft-com:xml-diffgram-v1'>
  <DocumentElement>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements1' msdata:rowOrder='0' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>1</_LE_FieldID>
      <_LE_Value>Components</_LE_Value>
    </tblCategoryLanguageElements>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements2' msdata:rowOrder='1' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>2</_LE_FieldID>
      <_LE_Value>Imported by OT2KARTRISSync</_LE_Value>
    </tblCategoryLanguageElements>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements3' msdata:rowOrder='2' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>3</_LE_FieldID>
      <_LE_Value />
    </tblCategoryLanguageElements>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements4' msdata:rowOrder='3' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>4</_LE_FieldID>
      <_LE_Value />
    </tblCategoryLanguageElements>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements5' msdata:rowOrder='4' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>5</_LE_FieldID>
      <_LE_Value />
    </tblCategoryLanguageElements>
    <tblCategoryLanguageElements diffgr:id='tblCategoryLanguageElements6' msdata:rowOrder='5' diffgr:hasChanges='inserted'>
      <_LE_LanguageID>1</_LE_LanguageID>
      <_LE_FieldID>8</_LE_FieldID>
      <_LE_Value />
    </tblCategoryLanguageElements>
  </DocumentElement>
</diffgr:diffgram>
</DataTable>

The Position (20,2) is this:

<diffgr:diffgram xmlns:msdata='urn:sche...

Any help appreciated !!

MadMaxApp

Answer 1

For DataSets and DataTables, there are special methods to write and read Xml. DataSets and DataTables can be serialized in a number of ways, so there are some overloads. From the XML you show in your question, I suspect that the caller sends a DiffGram of a DataTable to your webservice, a special format that contains the changes that have been made to the data in the DataSet or DataTable.
You can read the DiffGram using one of the ReadXml overloads.