Web site deletion events occur in the following cases:
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The Web site is deleted through the user interface.
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The folder that contains a Web site is deleted in an application that is compatible with Windows SharePoint Services (such as Microsoft Office SharePoint Designer 2007) through remote procedure call protocol (RPC).
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The folder that contains a Web site is deleted through Distributed Authoring and Versioning (DAV).
Web site deletion events only occur for the first Web site in a chain of sites. For example, if a Web site at http://TopSite/Site, which has the subwebs http://TopSite/Site/Subsite1 and http://TopSite/Site/Subsite2, is deleted in Office SharePoint Designer 2007, only one deletion event occurs, namely, for the http://TopSite/Site root Web site.
This class supports event cancellation and error messages.