Hi Anusha,
Sorry but Microsoft never published the classes for XmlSchemas to Silverlight, at least in Silveright 4. So we don't have a way to validate against a schema there or use one to provide automated completion like we do in WPF and WinForms. You should write Microsoft to request that they port over the XmlSchema and related classes to Silverlight so that adding those features is a possibility in the future.
