General question about webapps and hosting

Hi Experts,
I'd like to create a service which looks something up in a database and spit out some xml over http requests.  I want to choose the right technology - something I can pay someone else to host about 25$ / month max.  The number of users expected could be large (hopefully), maybe a million one day?  So it has to be fast and scalable (I'll be writing another question shortly about scalability).  If C# is an option, I'd like to take it.  C++ is probably better.  But knowing which hosting options that are out there, what is my best option?  Postgres and C++ are what I'm leaning towards.  So my question is, have you used a hosting solution and am I on the right track?  Which hosting solution should I take?

Many thanks,
Mike
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threadyAsked:
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wls3Commented:
Without getting a little more details, my first inclination is to suggest writing a web service.  Web services can be hosted on any IIS box for a nominal fee.  Additionally, if your traffic gets too heavy you can scale out by adding the web service to other servers and create a web farm.  In this case, C# is the most natural language Microsoft has to offer, although Visual Basic is only inches behind.  Also worth nothing: web services are, from what I can tell, being supplement by the Windows Communication Foundation (WCF).  WCF offers a more integrated programming platform to incorporate several older Microsoft technologies (remoting, web services, etc) into a single programmability model.  Although WCF is a little more complex than Web Services in .NET it may pay to jump straight to the newer option if both are new technologies.
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TSSTJeffCommented:
A secure webservice is the way to go, however at a million hits a day for $25 a month is probably a streach unless you are only returning "Hello World"  C#, VB or even Java can handle a web service. C++ is getting dated and dosent leverage everything in .net 3.5 or better. WCF is a presentation system for users it can and should be dependent on your web service but that is a development issue. Lastly database access is special and you should add to your concideration what database you will be accessing with your web service.  Depending on the type of data you are returning the database selection may be more important than your webservice.  
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threadyAuthor Commented:
thanks
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