For this article, you should be using Visual Studio 2010 or later, and some version of SQL ... database access classes work. This application has one form, with two combobox dropdowns, two buttons, ...

Create a console application project in Visual Studio First ... interface in C# will depend on the requirements of your application. If you want to query data from a database, use IQueryable.

Create an ASP.NET Core Web API project in Visual Studio ... in C# instead of SQL or some other query language. The ability to store and retrieve data in memory using the EF Core In-Memory Database ...

The C# objects return datatables, or null values, as appropriate through object method calls; the VB.NET objects return datatables, or nothing values, as appropriate through object method calls. For ...