see on GitHub

Session : How to Evict Single Entity from a Session

We can clear all session operations and stop tracking of all entities by the using Clear method, but sometimes there is need to only to do a cleanup only for one entity. For this purpose Evict was introduced.

Syntax

void Evict<T>(T entity);

Parameters
entity T Instance of an entity that will be evicted

Example I

Employee employee1 = new Employee
	              {
		              FirstName = "John", 
					  LastName = "Doe"
	              };

Employee employee2 = new Employee
	              {
		              FirstName = "Joe", 
					  LastName = "Shmoe"
	              };

session.Store(employee1);
session.Store(employee2);

session.Advanced.Evict(employee1);

session.SaveChanges(); // only 'Joe Shmoe' will be saved

Example II

Employee employee = session.Load<Employee>("employees/1-A"); // loading from server
employee = session.Load<Employee>("employees/1-A"); // no server call
session.Advanced.Evict(employee);
employee = session.Load<Employee>("employees/1-A"); // loading from server