If exception occurs in Catch block itself then how to handle it in C#?

Question

//I have written code in Catch Block

 try {

 } catch(Excepetion ex) {
        // I have written code here If Exception Occurs then how to handle it.
 }

Answer 1

The best way is to develop your own exceptions for different Layers of application and throw it with inner exception. It will be handled at the next layer of your application. If you think, that you can get a new Exception in the catch block, just re throw this exception without handling.

Let's imagine that you have two layers: Business Logic Layer (BLL) and Data Access Layer (DAL) and in a catch block of DAL you have an exception.

DAL:

try
{
}
catch(Excepetion ex)
{
  // if you don't know how should you handle this exception 
  // you should throw your own exception and include ex like inner exception.
   throw new MyDALException(ex);
}

BLL:

try
{
  // trying to use DAL
}
catch(MyDALException ex)
{
  // handling
}
catch(Exception ex)
{
   throw new MyBLLException(ex);
}