In this article I am giving you an introduction on SPWebApplication class. Most 
of the developers are naive about this class definitely this will give an 
introduction on the class
The SPWebApplication objects represents a SharePoint Web Application, which 
essentially is an IIS virtual server. Using this class we can do some high level 
operations. Please find some of the actions you can perform.
- 
Create a web application
- 
Collect all the features in a particular web application
- 
Delete a web application
- 
Some administrative task for the web application.
Below is a small example to delete a web application
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