Facade pattern in the .NET BCL

The GoF facade pattern is used in scenarios where a lot of work happens in the background and the interfaces to those classes are exposed using a simple API. The XMLSeralizer class in the .NET BCL does quite a bit of its work behind the scenes and access to those routines are given using a very simple interface. The following code snippets create a DataSet to store a multiplication table for the number 42 (remember Douglas Adams!) and the XMLSeralizer class persists the table to a text file:

    class Program 
    { 
      private static DataSet CreateMultTable() 
      { 
        DataSet ds = new DataSet("CustomDataSet"); 
        DataTable tbl = new DataTable("Multiplicationtable"); 
        DataColumn column_1 = new DataColumn("Multiplicand"); 
        DataColumn column_2 = new DataColumn("Multiplier"); 
        DataColumn column_3 = new DataColumn("REsult"); 
        tbl.Columns.Add(column_1); 
        tbl...