Derived exceptions must appear before base class exceptions. : Custom Exception : Language Basics C# Examples

    
using  System;  
  
class  MyException  :  ApplicationException  {  
    public  MyException()  :  base()  {  }  
    public  MyException(string  str)  :  base(str)  {  }  
  
    public  override  string  ToString()  {  
        return  Message;  
    }  
}  
  
class  MyDerivedException  :  MyException  {  
    public  MyDerivedException()  :  base()  {  }  
    public  MyDerivedException(string  str)  :  base(str)  {  }  
  
    public  override  string  ToString()  {  
        return  Message;    
    }  
}  
  
class  MainClass  {  
    public  static  void  Main()  {  
        for(int  x  =  0;  x  <  3;  x++)  {  
            try  {  
                if(x==0)  
                      throw  new  MyException("Caught  an  MyException  exception");  
                else  if(x==1)  
                      throw  new  MyDerivedException("Caught  an  MyDerivedException  exception");  
                else  
                      throw  new  Exception();  
            }  
            catch  (MyDerivedException  exc)  {  
                //  catch  the  exception  
                Console.WriteLine(exc);  
            }  
            catch  (MyException  exc)  {  
                //  catch  the  exception  
                Console.WriteLine(exc);  
            }  
            catch  (Exception  exc)  {  
                Console.WriteLine(exc);  
            }  
        }  
    }  
}