This document discusses how to write and load XML data from a DataSet in ADO.NET. It describes using the WriteScheme and WriteXml methods to write the contents of a DataSet to an XML file, stream, or XmlWriter. It also covers using the ReadXml method to load a DataSet from an XML file, stream, or XmlReader, which will populate the DataSet with data and generate its relational schema based on the XML structure and specified XmlReadMode. Code snippets demonstrate writing a DataSet to an XML file and reading XML data into a new DataSet.

1. Using XML in a DataSet
(ADO.NET)
Ringo Ray H Piedraverde
(Jr. Programmer)

2. Topics
• Writing DataSet Contents as XML Data
(ADO.NET)
• Loading a DataSet from XML (ADO.NET)

3. Writing DataSet Contents as XML
Data (ADO.NET)
• WriteScheme Method
– Writes the current contents of the DataSet as XML
data with the relational structure as inline XML
Schema.
• WriteXml method
– Using this method you can write the Dataset to a
file, stream, or XmlWriter.

4. Code Snippet
Dim mds As DataSet = mds.tables(“tblUser”)
mUserDS.WriteXml(“User.xml", XmlWriteMode.WriteSchema)

5. Xml output

6. Loading a DataSet from XML
(ADO.NET)
• To fill a DataSet with data from XML, use the ReadXml
method of the DataSet object. The ReadXml method
reads from a file, a stream, or an XmlReader, and takes
as arguments the source of the XML.
• The ReadXml method reads the contents of the XML
stream or document and loads the DataSet with data. It
will also create the relational schema of the DataSet
depending on the XmlReadMode specified and whether
or not a relational schema already exists.

7. Code snippet
Dim m_Ds as Dataset
Public sub ReadXML()
m_User.ReadXml(“User.xml", XmlReadMode.ReadSchema)
End Sub

8. Reading Output

9. • End