C#

void Application_Error(Object sender, EventArgs e)
{
    var exception = Server.GetLastError();
    var httpException = exception as HttpException;
    Response.Clear();
    Server.ClearError();

    var routeData = new RouteData();
    routeData.Values["controller"] = "Error";
    routeData.Values["action"] = "General";
    routeData.Values["exception"] = exception;
    Response.StatusCode = 500;

    if(httpException != null)
    {
        Response.StatusCode = httpException.GetHttpCode();
        switch(Response.StatusCode)
        {
            case 403:
                routeData.Values["action"] = "Http403";
                break;
            case 404:
                routeData.Values["action"] = "Http404";
                break;
        }
    }

    IController errorController = new ErrorController();
    var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
    errorController.Execute(rc);

}

if(albums != null)
{
    albums = null;
    ctx.SpotifyAlbums.AddRange(albums);
    ctx.SaveChanges();
}

public class ConvertibleClass<T>
    {
        T holder;
        public ConvertibleClass(T obj)
        {
            holder = obj;
        }

        public static implicit operator ConvertibleClass<T>(T obj)
        {
            return new ConvertibleClass<T>(obj);
        }

        public static implicit operator T(ConvertibleClass<T> obj)
        {
            return obj.holder;
        }
    }

    public interface IGenericInterface<T>
    {
    }


    public class GenericClass : IGenericInterface<AnyClass>
    {
        public GenericClass(int id)
        {
            ID = id;
        }
        public int ID { get; set; }
                
    }

    public class AnyClass
    {        }

public void DoSomthing(IGenericInterface<AnyClass> doSomthingWithThis)
        {

            List<ConvertibleClass<IGenericInterface<AnyClass>>> ListOfMedies = new List<ConvertibleClass<IGenericInterface<AnyClass>>>(); // medi is defined with base interface, no name of GenericClass

            ConvertibleClass<IGenericInterface<AnyClass>> item = new GenericClass(4); // This works!
            ListOfMedies.Add(new GenericClass(1)); // why genericClass works?!!!!
            ListOfMedies.Add(item);
            
            ListOfMedies.Add(new GenericClass(2));

            item = doSomthingWithThis; // but not this
            ListOfMedies.Contains(doSomthingWithThis); // or this one , I need This line to work
            ListOfMedies.Add(doSomthingWithThis); // or even this , I need This line to work
            // these lines does not compile and error is 'Cannot implicitly convert type 'SomeNameSpace.IGenericInterface<SomeNameSpace.AnyClass>' to 'SomeNameSpace.ConvertibleClass<SomeNameSpace.IGenericInterface<SomeNameSpace.AnyClass>>'. An   explicit conversion exists (are you missing a cast?)'
            
        }

DoSomthing(new GenericClass(4));