This document discusses exception handling in C#. It introduces exceptions as problems that arise during program execution, such as dividing by zero. It explains that exception handling consists of finding problems, informing of errors, getting error information, and taking corrective action. It then lists common exception classes in the .NET library and explains how exceptions are managed using try, catch, finally, throw, checked, and unchecked keywords. Code examples demonstrate trying code that may cause exceptions and catching specific exception types.

1. Exception Handling in C#
Prepared by:
Ezzat Harki
Copyright © 2013 Ezzat Harki

2. What Aim in This presentation
 Introduction to exception
 Advantage for pupil
 Mark for myself
Copyright © 2013 Ezzat Harki

3. What is Exception
 An exception is a problem that arises during the execution of a program. A C#
exception is a response to an exceptional circumstance that arises while a
program is running, such as an attempt to divide by zero.
Copyright © 2013 Ezzat Harki

4. This mechanism consist of
 Find the problem
 Inform that an error has occurred
 Receive the error information
 Take corrective action
Copyright © 2013 Ezzat Harki

5. Type of all Exception Class in C# library
Name
Access Violation Exception
AggregateException
AppDomainUnloadedException
ApplicationException
ArgumentException
ArgumentNullException
ArgumentOutOfRangeException
ArithmeticException
ArrayTypeMismatchException
BadImageFormatException
CannotUnloadAppDomainException
Copyright © 2013 Ezzat Harki

6. Cont.Type of all Exception Class in C# library
Name
ContextMarshalException
DataMisalignedException
DecoderFallbackException
DirectoryNotFoundException
DivideByZeroException
DllNotFoundException
DriveNotFoundException
DuplicateWaitObjectException
EncoderFallbackException
EndOfStreamException
EntryPointNotFoundException
ExecutionEngineException
Copyright © 2013 Ezzat Harki

7. Cont.Type of all Exception Class in C# library
Name
FieldAccessException
FileLoadException
FileNotFoundException
FormatException
IndexOutOfRangeException
InsufficientExecutionStackException
InsufficientMemoryException
InternalBufferOverflowException
InvalidCastException
InvalidDataException
InvalidOperationException
InvalidProgramException
InvalidTimeZoneException
IOException
Copyright © 2013 Ezzat Harki

8. Cont.Type of all Exception Class in C# library
Name
KeyNotFoundException
MemberAccessException
MethodAccessException
MissingFieldException
MissingMemberException
MissingMethodException
MulticastNotSupportedException
NotFiniteNumberException
NotImplementedException
NotSupportedException
NullReferenceException
ObjectDisposedException
OperationCanceledException
OutOfMemoryException
Copyright © 2013 Ezzat Harki

9. Cont.Type of all Exception Class in C# library
Name
OverflowException
PathTooLongException
PlatformNotSupportedException
RankException
StackOverflowException
SystemException
TaskCanceledException
TaskSchedulerException
TimeoutException
TimeZoneNotFoundException
TypeAccessException
TypeInitializationException
TypeLoadException
TypeUnloadedException
Copyright © 2013 Ezzat Harki

10. Cont.Type of all Exception Class in C# library
Name
UnauthorizedAccessException
UriFormatException
Copyright © 2013 Ezzat Harki

11. In C# Exception Handling is Managed by
that Keyword
 Try
 Catch
 Finally
 Throw
 checked
 Unchecked
Copyright © 2013 Ezzat Harki

12. Diagram working try & catch
Try block
Copyright © 2013 Ezzat Harki
Catch block
Statement that
Cause Exception
Statement that
Cause Exception

13. Diagram working try & catch wit Finally
Try block
Copyright © 2013 Ezzat Harki
finally
Catch blockfinally

14. Coding How to work try & catch with
finallyTry
{
statement;
//statement causing exception
}
Catch(exception type varable)
{
statement;
//error handling code
}
finally
{
//statement to be executed
statement;
}
Copyright © 2013 Ezzat Harki

15. It is Coding Example of Exception
 byte x = 129, y = 129, result;
 try
 {
 result =unchecked ((byte)(x + y));
 Console.WriteLine("The Result is Unchecked ", result);
 //at The Top Line Result is Unchecked But Get Wrong Result Becouse byte always can 256 count
 result =checked((byte)(x + y));
 Console.WriteLine("The Result is Checked ", result);
 //But in This Line Checked Result if Get Overflow Tell you
 }
 catch (OverflowException ovex)
 {
 Console.WriteLine(ovex.Message);
 }
Copyright © 2013 Ezzat Harki

16. Copyright © 2013 Ezzat Harki
If this presentation helped you please visit our page in facebook
and like it thanks for hearing
facebook.com/c.s.soran.university
NoteYou Can Download and Useful This Presentation
But Please Do Not Erase The Owner Name Ezzat Harki
If You Need Help Please Ask me at Facebook.com/Ezzat.Harky