Error handling in ASP.NET
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This document discusses error handling in ASP.NET. It explains what exceptions are and the disadvantages of unhandled exceptions. It introduces try-catch blocks to handle exceptions, and shows examples of handling different types of exceptions like FileNotFound and unauthorized access. It also discusses ASP.NET error events like Page_Error and Application_Error to handle exceptions at the page and application level respectively. The document is intended to help trainees learn about exception handling in ASP.NET applications.
Error handling in ASP.NET
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
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- 5. Error Handling in Asp .net MuhammedAjaml [email protected] www.facebook.com/ajuik twitter.com/username in.linkedin.com/in/profilename 9745020951
- 6. Exception • Exceptions are unforeseen errors that happen within the logic of an application. – File not found – Unautherised access – Argument NullException – Arithmetic Exception
- 7. Unhandled exception • When an exception occurs and if it is not handled.
- 8. Unhandled exception • An unhandled exception is displayed to the user using an”yellow screen of death”
- 9. 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
- 10. Exception handling using - try- catch Try { Wrap the code in a try block that could possibly cause an exception } Catch(Exception e) {//handle errors} Finally {//Used to free resources.}
- 11. Example • A program to read data from XML file and display it to the Grid View
- 12. Countries.xml
- 13. Bind to gridview
- 14. Show Data
- 15. File not found Exception
- 16. Error
- 18. Show Error
- 20. Show Error
- 21. 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.
- 24. Page_error
- 25. Errors.aspx
- 26. Application_Error • When there is an unhandled exception at an application level. • The event handler resides in Global.asax file
- 27. Contd..
- 28. Thank You
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