I was thinking about, How to extend service functionality without breaking existing clients (Thinking about old COM rules) COM interface rules still apply to wcf contract. Contract/service level: (1)Adding new method to the service won’t break existing
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(1)Make sure you have MDAC 2.6, sp2 higher and make sure you have oracle client (we have lot of problems with oracle 8i client,We recommend to use oracle client 9i or higher) ( (2)Make sure Network service account has read access to oracle client dlls.
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http://forums.microsoft.com/msdn/showforum.aspx?forumid=118&siteid=1
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http://windowscommunication.net/default.aspx?tabindex=3&tabid=45
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