small Billing system

Avg Bid (USD)
Project Budget (USD)
$30 - $150

Project Description:
We require a small billing systems with customers, supplayers, items or services,payments
the system will start with a splash screen.
on the left side we will have the menu, and on the rigth it will point to an html page in the web.
it must work with many clients at the same time, i will say how many clents depending the need i have each time.
we would like to be able to view all customers supplayers items and export them on an ms excel also we would like to know the remainder value for each customer , supplayer after accepting a payment, we also want to view the a list of items that are remainig in stock and a list with the payments.
the system must be able to add a new customer, sypplayer with his details i will give you all the details.
tax it must be calculated also depending the customer and the items or services.
also you have to know that i need may types of invoice and have the ability to create a type each time.

and finaly it must print an invoice in printer and in pdf format and send it via e-mail if the user wants to .
also it must have a button to cheak for updates and to download the file form the web.
users must log in tho the system using a user name and a password, this user name and password i wil need an interface for it
also the interface must be nice and robust
The project must be writen in Visual studio 2012 with an acess or sql express database.
you must know that you have t submite to me all the source code of the application plus additional comments in the code.
waiting for your offers

Skills required:
Microsoft, SQL, Visual Basic, Windows Desktop
About the employer:
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