Xml Techniques(Convert datatable to xml formate along with schema)

(1)Convert datatable to xml formate with schema and withought schema in C#.Net
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 DataTable ResultSerWithMiddleSerchText = new DataTabl();
System.IO.StringWriter writer = new System.IO.StringWriter();
(a) with schema
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ResultSerWithStartSerchText.WriteXml(writer, XmlWriteMode.WriteSchema, true);
string resultData = writer.ToString();

(b) with out schema
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ResultSerWithStartSerchText.WriteXml(writer, XmlWriteMode.WriteSchema, false);
string resultData = writer.ToString();