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Have a look on this site
https://www.commusoft.co.uk/. There are lot of videos on this site to understand the process. Please go through these videos/contents before writing anything for this project.
This software manages plumbing and heating services. I need something similar to this. c# .NET is the preferred language for development. Visual Studio 2012 or 2013 would be preferred IDE.
You can send me separate costing for Web interface, IPhone, Android apps and windows interface.