Mobile APP / Webservice CSV

We are looking for two applications: One for mobile phones - android and iphone. The other one as a windows service working on our enterprise server. We have some csv files (or a similar simple database file) on the server. From mobile we want to have a look inside these files. For example we have an address list as csv file I want to be able to enter a name on my mobile phone and the service should look inside the csv files on the server. Our ERP system has a special kind of database which we are able to program - the csv file is just a simple solution to begin programming. The implementation of the other database is done ourselves. Specials: We want to have the app as simple as possible. Choose name or city or anything else and look in the right database files on our server. It should run on iphone and android phones - so please use something like "Titanium Appcelerator" or something else which is capable to build apps for different os. On the Windows Server side we can open a special TCP/IP port for communication but we don`t want to use a WebServer like iis - it should run as a services. As I mentioned the App should be programmed in an "universal language" which is free to get. The service must be programmed in Visual Studio 2005 - 2010 in "Visual Basic" or "Visual C" We have skills in doing applications in Visual Basic / C but we didn`t realized a service or a app until now so what we want to have just an example of how to do it - to start programming the goal application ourselves. Therefore we will need the source code of all the programs to do modifications. We are located in germany.