1. Exception Handling
By: Enas Naffar

2. Exceptions
An Exception is a problem that takes place at the execution of a program (at runtime).
Example: Division by zero

3. Code structure try {…..} catch // Possibly more than one catch { …}
finally
{… }

4. Code structure
 A try block contains the code that might holds an exception.
A catch block is used to handle any resulting exceptions.
A finally block contains the code that should always be executed.
A try block requires one or more associated catch blocks, or a finally block, or both.

5. Exception examples FileNotFoundException FormatException
DivideByZeroException

6. Exception properties Some Exception properties: Message StackTrace
HelpLink

7. User-defined exceptions
A user-defined exception class should inherits from Exception class.
public class myexecption : Exception
It is preferred to provide (at least) the same constructors of the base class and passing the parameters to the base class constructors
public myexecption(string m) : base(m) { }

8. In the try block, the programmer throws an exception.{
………
if (x == 1)
throw (new myexecption(“invalid”)); }