Here Mudassar Ahmed Khan has explained with an example, how to use ConfigurationManager.AppSettings in .Net Core and ASP.Net MVC Core.

Microsoft has replaced ConfigurationManager.AppSettings class of System.Configuration namespace with IConfiguration interface in .Net Core 2.0.

Here Mudassar Ahmed Khan has explained with an example, how to read AppSettings from AppSettings.json file in .Net Core and ASP.Net MVC Core.

Microsoft has replaced System.Configuration class with IConfiguration interface in .Net Core 2.0.

Here Mudassar Ahmed Khan has explained with an example, how to use ConfigurationManager.ConnectionStrings in .Net Core and ASP.Net MVC Core.

Microsoft has replaced ConfigurationManager.ConnectionStrings class of System.Configuration namespace with IConfiguration interface in .Net Core 2.0.