Silverlight 4, subclassing WebClient?

WebClient's constructor is marked with the SecuritySafeCritical attribute. And it looks like that is what is causing the security exception. I tried applying that same attribute to MyWebClient 's constructor but that didn't work.

From what I've read, this kind of thing just isn't allowed in Silverlight. For example, see this other question .

You need to implement a default constructor with the SecuritySafeCritical attribute. Had this problem today and that was the solution.

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