Save xml file with indenting

XmlTextWriter textWriter = new XmlTextWriter(@"D:\temp.xml", null);
textWriter.Formatting = Formatting.Indented;
MyXmlDoc.Save(textWriter);

How to generate a XML file From XSD schema

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XML XSD validator class

Use this class to validate an xml file against it's xsd schema...

XML node encryption (TripleDES)

Use this class to encrypt or decrypt one ore more xml nodes with sensitive data, with the use of the TripleDES encryption algorithm. This encryption generates only private keys. (symmetric encryption)