This post explains some steps that you can do to enable Cors on your WebAPI and also allow Http verbs PUT and DELETE which are not enabled by default.
This post explains the Repository pattern implementation with Entity Framework and C# that can be used in WebAPI or ASP.Net MVC.
This post explain selecting data between two tables with many-many relationship using Entity Framework linq query and C#.
This post explains how to handle many-many relationship with join table in database using Entity Framework and C#.
This post explains re-sizing the image using C# while preserving the aspect ratio.