What are lazy/deferred loading and eager loading?

Lazy/Deferred Loading: In case of lazy loading, related objects (child objects) are not loaded automatically with its parent object until they are requested. By default LINQ supports lazy loading.

DataContext context = new DataContext(); var query = context.Department.Take(3); // Lazy loading foreach (var Dept in query) {   Console.WriteLine(Dept.Name);   foreach (var Emp in Dept.Employee)   {     Console.WriteLine(Emp.EmpID);   } }

DataContext context = new DataContext(); var query = context.Department.Include("Employee").Take(3); // Eager loading foreach (var Dept in query) {   Console.WriteLine(Dept.Name);   foreach (var Emp in Dept.Employee)   {    Console.WriteLine(Emp.EmpID);   } }