Hi John.

>Does it 100% written in .NET or only front end? What about data? Where foes it store?

The engine code is 100% C#. The front end is an MVC application using HTML 5, CSS, Bootstrap, jQuery, etc.

Data can be anything: SQL Server, Oracle, MySQL, XML, your own dataset, etc.

Stonefield Query's own data, such as meta data, can be stored anywhere you wish. The default is SQLite, which is installed along with Stonefield Query, but you can specify your own connection string, such as SQL Server, Oracle, MySQL, etc.

Doug