A database can hold and serve you data no matter where you connect from. Point both applications to the save server and you'll be just fine.
No offence, but I read you're going to build a website and in contrast with your question I can't help but think that if you - or your client - exposes a site that begun with this type of question, to the internet it will become the playground for SQL injections.
Read about SQL injection and build into your project -especially the ASP part - the practises that will minimize the danger.
adam_k
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