c# - How to do client-server over the internet -

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we want create apps connects our database (sybase ads, connectable via .net) on internet. clients include windows forms app , android app phones , devices.

i know c#. i'm new web apps , webservices bear me here.

i'm thinking maybe best way creating webservice in c# run on iis interrogate ads database using ado.net.

so webservice expose methods via wcf can consumed clients.

the clients invoke methods via wcf. right in thinking wcf return data in .net xml objects?

also can .net forms consume xml objects easily?

the apps have bespoke restricted access using credentials.

how approach sound? performance or security issues think about? data not classified wouldn't want snoopers able pick phone numbers etc.

can security sorted out going http https?

what performance. presumably slower if apps connected using ado.net ads on lan. wcf use bufers http requests? e.g. can can start reading stream on client before whole http request has finished? i'm thinking populating list boxes of large record nos. etc


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