C Sharp Debugging and Exception Handling Tutorial Videos for Beginner (1)

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C Debugging and Exception Handling Tutorial
Videos for Beginners by
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Highlights

• Understanding runtime exceptions
• Debugging exceptions
• Handling exceptions with try/catch
• Multiple catch statements
• Cleaning up with finally

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Understanding runtime exceptions

• Runtime errors meant for errors occur when a
  program is running.
• Exceptions would be generated by the common
  language runtime (CLR).
• Exceptions can also be generate by .NET Framework
  or third-party libraries, or by application code.
  
• Exceptions are created by using
  the throw keyword.
• Exceptions derive from System.Exception
• Exception objects contain detailed information
  about the error.

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Debugging exceptions

•  Use the Exception Settings to specify which
  exceptions will cause the debugger to break.
•  WE can add or delete exceptions or specify
  exceptions.
• Check Debug / Windows / Exception Settings.
• discover particular exceptions by using
  Search window in the Exception
  settings toolbar.
• Debugger can break execution where an exception
  is thrown.

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Handling exceptions with try/catch

• Try-catch statement consists of a try block
  followed by one or more catch clauses, which
  specify handlers for different exceptions.  
• Try block is used by C programmers to partition
  code that might be affected by an exception.
  Catch blocks are used to handle any resulting
  exceptions.
• When an exception is thrown, the common language
  runtime (CLR) looks for the catch statement that
  handles this exception.
• Catch block is a series of statements, begins
  with the keyword catch, followed by an exception
  type and an action to be taken.

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Handling exceptions with try/catch

• Syntax for try/catch statements
• try
• StreamReader tu File.OpenText("data.txt")
• Console.WriteLine("The first line of this file is
  0", tu.ReadLine())
• tu.Close()
• catch (Exception e)
• Console.WriteLine("An error occurred '0'", e)

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Multiple catch statements

• We can mention multiple catch blocks associated
  with one try block.
• Only single catch block can ever handle exception
  thrown by try block.
• Which catch block matches the exception type is
  only get executed.
• Syntax try
• catch (IOException exp1) // Block 1
• catch (Exception exp2) // Block 2

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Cleaning up with finally

• finally block clean up all resources that are
  allocated in a try block.
• Executes code even if an exception occurs in
  the try block.
• finally block run when control leaves
  a try statement.
• Syntax try
• ... // Code that might generate error ...

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Cleaning up with finally

• catch (ExceptionType1 e1)...
• catch (ExceptionType2 e2)...
• finally
• // Always executed, whether try terminates
  normally or ... // exceptionally. Use for cleanup
  statements

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