Page 133 - DCAP312_WEB_TECHNOLOGIES_II

Unit 6: Error Handling

• The custom Errors element of the Web.config file is the last line of defence against an Notes
unhandled error.

• The difference between Message and Message Detail above is that MessageDetail contains
error information that is WebAPI-specific that remote clients should not have to see in
most cases.
• Web API is a brand new framework that makes it easy to build HTTP services. As such,
it provides several features that make it easy to send back useful and informative error
messages in a variety of cases.

6.7 Keywords

ASP.NET: It is a Web application framework developed and marketed by Microsoft to allow
programmers to build dynamic Web sites, Web applications and Web services.

Exception Handling: It is the process of responding to the occurrence, during computation, of
exceptions anomalous or exceptional situations requiring special processing often changing the
normal flow of program execution.
Hypertext Transfer Protocol: The Hypertext Transfer Protocol (HTTP) is an application protocol
for distributed, collaborative, hypermedia information systems.
Web API: A Web API (Application Programming Interface) is typically a defined set of HTTP
request messages along with a definition of the structure of response messages, typically
expressed in JSON or XML.

Web.Config: Web.config is the main settings and configuration file for an ASP.NET web
application.
1. Create a Web.config file in Visualstudio.

2. Prepare a flow chart to handle an exception.

6.8 Review Questions

1. Define the logics of error handling.
2. What are the aspects of error handling?

3. Explain the levels of error handling.
4. Define the web application error handling in ASP.NET.
5. Explain error handling in ASP.NET web API.

6. Define error handling using the page error or on error sub.
7. What is the custom error handling in ASP.NET?
8. Define web config file.

9. Explain Http response exception.
10. Explain global.Asax File?

Answers for Self Assessment Questions
1. (a) 2. (b) 3. (c) 4. (d) 5. (a)
6. (b) 7. (d) 8. (c) 9. (a) 10. (b)
11. (d) 12. (a) 13. (d) 14. (b) 15. (a)

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