ExplicitLoading.cs

/*
There are options to disable Lazy Loading in an Entity Framework. 
After turning Lazy Loading off, you can still load the entities by explicitly calling the Load method for the related entities. 
*/

User usr = dbContext.Users.FirstOrDefault(a => a.UserId == userId);  
dbContext.Entry(usr).Reference(usr => usr.UserDetails).Load();  

/*
There are two ways to use Load method:
.Reference - to load single navigation property
.Collection - to load collections.
*/