Send data from a Scale (measure weight) to a Touch Screen Monitor using Asp,net, c#

There will be an online application to accept product bar-code and weight until its weight is entered by the cashier so that program could display the amount to be paid. I need some information to interface the scale with this application.

Question 1: What type scales will output weight information for the application use?
Question 2: What are the means and options to interface the scale input to the application screen?

Eventually, the data will be stored in a database.

Question 3: In order not to reinvent the wheel, what systems are available in low price range?

Thank you,
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Mike EghtebasDatabase and Application DeveloperAsked:
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David Johnson, CD, MVPOwnerCommented:
each scale manufacturer has an api or .dll and all the scale returns is the weight in grams. You will need a database that has the upc codes and the price/gram. you do a query on the upc code to get the price/gram and multiply it by the returned # of grams and that gives you the price.
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