Handels operation with SQL Server. Uses currently ADO.NET for connection.
The Class is implementet as Singleton Pattern.


Methods:

*GetInstance() returns the Singleton Instance of this class. Fill the commandtext property of the SqlCommand with the Procedurename.
The method will transform the result of the db with an xsl document.
Other Overloadings: public XPathDocument CallProcedureSelect(SqlCommand cmd) This method is an serialization helper. Invokes an sql statement on the database. The use of procedures is recommended.