ASP.Net - Impersonation - Solid Example?

Hello all,

I am trying to really understand impersonation from the aspect of when would it be useful and a easy way to understand it.  I know I have had to enable it in certain error cases and I know when you enable it you are relying on IIS to use the client authentication VS the ASPNET account.  I am just trying to wrap my head around in what cases would you use it as it is disabled by default.
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Impersonation is used when you need to executed in context of user who requested or posted the page. For example consider you want to read files from folder on server and folder has read permissions only for User1. If you will not use impersonation, then code will be executed in context of user, which does not has permissions and operation will fail. But if you use impersonation and login as User1 then code will be executed in context of User1 and operation will succeed.

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sbornstein2Author Commented:
perfect example, thanks
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