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What type of mobile application are you talking about? &nbsp;<br />
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If you are able to serialize/deserialize a JSON object, then you can use any database technology to read/write from a database, like OR/Ms, ADO.NET, ..., whatever you like.
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Android and OS using phone gap or is Xamarin better?
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Ok How can I use Json to talk to MS-sql database and what can i use as a controller if the application is separate.
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Ok How can I use Json to talk to MS-sql database and what can i use as a controller if the application is separate.

mobile json

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Most development for the Microsoft platform is done utilizing the technologies supported by the.NET framework. Other development is done using Visual Basic for Applications (VBA) for programs like Access, Excel, Word and Outlook, with PowerShell for scripting, or with SQL for large databases.