[Mono-list] System.Net.WebClient

[ginga]

Hello,

I have plan to implement XmlUrlResolver. It would be convenient
for this class if OpenRead(),  DownloadData(), DownloadFile() of
System.Net.WebClient are implemented. 

Then I wrote very easy implementation for those methods.
I'll be grateful if anyone working with System.Net reviews the
attachment and commit somewhat I want.

Thanks,

-- Atsushi Eno

WebClient.diff
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