Derived exceptions must appear before base class exceptions

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Derived exceptions must appear before base class exceptions. 
 
using System; 
 
// Create an exception. 
class ExceptA : ApplicationException { 
  public ExceptA() : base() { } 
  public ExceptA(string str) : base(str) { } 
 
  public override string ToString() { 
    return Message; 
  } 
} 
 
// Create an exception derived from ExceptA 
class ExceptB : ExceptA { 
  public ExceptB() : base() { } 
  public ExceptB(string str) : base(str) { } 
 
  public override string ToString() { 
    return Message;  
  } 
} 
 
public class OrderMatters { 
  public static void Main() { 
    for(int x = 0; x < 3; x++) { 
      try { 
        if(x==0) throw new ExceptA("Caught an ExceptA exception"); 
        else if(x==1) throw new ExceptB("Caught an ExceptB exception"); 
        else throw new Exception(); 
      } 
      catch (ExceptB exc) { 
        // catch the exception 
        Console.WriteLine(exc); 
      } 
      catch (ExceptA exc) { 
        // catch the exception 
        Console.WriteLine(exc); 
      } 
      catch (Exception exc) { 
        Console.WriteLine(exc); 
      } 
    } 
  } 
}

1.	Exception handle with your own exception class
2.	illustrates a custom exception
3.	Demonstrates defining and using a custom exception class
4.	illustrates the use of a System.Exception object
5.	Using Exception members
6.	Use the NullReferenceException
7.	Use a custom Exception for RangeArray errors
8.	calls GetBaseException and outputs the error message of the initial exception.
9.	uses some of the properties of the Exception class
10.	Using checked and unchecked
11.	refines the System.Exception base class with name of the type and time of exception to create your own Exception
12.	Using checked and unchecked with statement blocks
13.	Exception Handling: The Exception Hierarchy 1
14.	Exception Handling: The Exception Hierarchy 2
15.	Exception Handling: The Exception Hierarchy 3
16.	Exception Handling User-Defined Exception Classes

Derived exceptions must appear before base class exceptions : Exception Class « Language Basics « C# / C Sharp

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