I would load a list of banned sites into a collecion on the app, preferably from an encrypted file, and then test every navigation, if it is on the list, redirect.
There shouldn't be any problem using a local file.
I think the code is something like, yourBrowserName.Navigate(string URL);
But I think you should ask a more specific question, what part of this are you having trouble with.
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They say, best men are molded out of faults,
And, for the most, become much more the better
For being a little bad.
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