Inventory Lookup/Point of Sale Application

Need an inventory lookup app that displays a grid of 10-15 columns of data, automotive parts related. Search will be done by Year->Make->Model->Part. Application will be Windows-based and written in c# or c++. Must use MSSQL as the database. I will be providing application form designs (GUI), to give coder a template of functionality expected in application. Basic invoicing features will be included such as being able to add searched items into quote, invoice, purchase order. Application must keep track of customer accounts and track invoices and purchases in an efficient and searchable manner.