Error handling in ASP.NET
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Transcript of Error handling in ASP.NET
Disclaimer: This presentation is prepared by trainees ofbaabtra as a part of mentoring program. This is not officialdocument of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .Ltd
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Error Handling in Asp .net
Muhammed Ajaml
www.facebook.com/ajuik
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in.linkedin.com/in/profilename
9745020951
Exception
• Exceptions are unforeseen errors that happen within
the logic of an application.
– File not found
– Unautherised access
– Argument NullException
– Arithmetic Exception
Unhandled exception
• When an exception occurs and if it is not handled.
Unhandled exception
• An unhandled exception is displayed to the user using
an”yellow screen of death”
Disadvantage of yellow screen of
death. The error messages are cryptic and may not make any
sense to the end user
. The exception information may be useful for a hacker,
to hack into your application
Exception handling using - try-
catchTry
{
Wrap the code in a try block that could possibly cause an
exception
}
Catch(Exception e)
{//handle errors}
Finally
{//Used to free resources.}
Example
• A program to read data from XML file and display it
to the Grid View
Countries.xml
Bind to gridview
Show Data
File not found Exception
Error
Try –catch-finally
Show Error
Unauthorised Exception
Show Error
Asp .net Error Events
• Page_Error
– Used in page level
– This event raised whenever an unhandled exception occurs
in the page.
• Application_Error– Used in application level
– This event raised whenever an unhandled exception occurs
in the application.
Page_Error Example
Yellow screen death
Page_error
Errors.aspx
Application_Error
• When there is an unhandled exception at an
application level.
• The event handler resides in Global.asax file
Contd..
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