Does ADO.NET unified the way to use parameters in sql query string?

No matter what database server or driver are being used, can ADO.NET layer
supports so called named or unnamed parameters? And defines fixed parameter
marker character? Does ANSI SQL define rules for parameter marker?

That way, maybe easier to develop application works with most database
server.

Thanks,

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 Ryan Liu
 Shanghai Fengpu Software Co. Ltd
 Shanghai , China

 http://www.PowerCATI.com  Powerful CATI!
 http://www.fpsoft.net.cn
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