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Factory Method Pattern, C# implementation:

//Factory Method design pattern implementation in C#

//------------------------------------
// The DB Interface Implementation

using System;
public enum TypeDB {SQLite, PostgreSQL};

interface DB
{
  void Open();
  void Close();
}
//------------------------------------------
// The Fabric class implementation

class FabricDB
{
  public DB GetDB (TypeDB typeDB)
  {
    DB ret = null;
    switch ( typeDB )
    {
      case TypeDB.SQLite : ret = new SQLiteDB(); break;
      case TypeDB.PostgreSQL : ret = new PostgreDB(); break;
      default : break;
    }
    return ret;
  }
}
//------------------------------------------
// The database processing concrete realization classes

class PostgreDB : DB
{
  public void Open() { /* PostgreDB implementation here*/ }
  public void Close() { /* PostgreDB implementation here*/ }
}

class SQLiteDB : DB
{
  public void Open() { /* SQLiteDB implementation here*/ }
  public void Close() { /* SQLiteDB implementation here*/ }
}

//------------------------------------------
// The client class implementation

class MyApplicationClass
{
  public static void Main()
{

  FabricDB fd = new FabricDB();
  DB postgreDB = fd.GetDB( TypeDB.PostgreSQL );
  DB sqliteDB = fd.GetDB( TypeDB.SQLite );

   sqliteDB.Open();
   /*.. work with SQLite here ..*/
   sqliteDB.Close();

   postgreDB.Open();
   /*.. work with PostgreSQL here ..*/
   postgreDB.Close();

}
}

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