Core .NET Libraries

• System String public sealed class String
• System Object public class Object
• System Exception public class Exception
• System DateTime public struct DateTime
• System.Collections.Generic List<T> public class List<T>
• System.IO File public static class File

ASP.NET Core APIs

• Microsoft.AspNetCore.Mvc ControllerBase public abstract class ControllerBase
• Microsoft.AspNetCore.Mvc IActionResult public interface IActionResult
• Microsoft.AspNetCore.Hosting WebHost public static class WebHost

Entity Framework Core APIs

• Microsoft.EntityFrameworkCore DbContext public abstract class DbContext
• Microsoft.EntityFrameworkCore DbSet<TEntity> public class DbSet<TEntity>