Design and Architecture

rokford wrote:

To avoid this we decided to develop some "common gateway" - middle tier that will be used by all applications that need to access any data sources. Also we plan to implement WCF for this task.

rokford wrote:

Unlike ADO.NET we plan to implement some middle tier that will common for all applications (developers). So the main task is to access different data sources using some abstract model.

public class ClassA
{
  public virtual void DoThis()
  {
    Console.WriteLine("Hello");
  }
}

public class ClassB : ClassA
{
  public override void DoThis()
  {
    base.DoThis();
    Console.WriteLine("World");
  }
}

ClassB myClass = new ClassB();
myClass.DoThis();

ClassA myClass = new ClassB();//note variable type is ClassA<br />
myclass.DoThis();