Hello
Are you planning to implement a web cafe visitor tracking system in online ? Upto my knowledge you won't be able to do this. Because ASP.NET is server based scripting language. Whatever ASPX page you are seeing through browser is the processed output. Processing will be done in the server and output will be send to the requesting browser. Since your webcam is in client machine, you won't get the drivers and connection with it on the server side,
What you can do is create a webservice that accepts all details like phone number, and stores in a DB. Then using a windows application you can refer this webservice, Using this windows app you can capture photo from webcam and send the details including photo to webservice which will be updated in the server. To get the database values, create another ASPX page.
Happy Programming
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Sincerely
Navaneeth.K.N
www.w3hearts.com
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