last_insert_id？C#,SQL Server和NHibernate

using System.Data.SqlClient;

SqlConnection connection = new SqlConnection("Data Source=myServerAddress;Initial Catalog=myDatabase;User Id=myUsername;Password=myPassword;");
SqlCommand command = new SqlCommand("INSERT INTO myTable (column1, column2) VALUES (@value1, @value2); SELECT CAST(SCOPE_IDENTITY() AS INT)", connection);

command.Parameters.AddWithValue("@value1", "someValue1");
command.Parameters.AddWithValue("@value2", "someValue2");

connection.Open();

int lastInsertId = (int)command.ExecuteScalar();

connection.Close();

using NHibernate;

ISession session = sessionFactory.OpenSession();
ITransaction transaction = session.BeginTransaction();

MyEntity entity = new MyEntity();
entity.Column1 = "someValue1";
entity.Column2 = "someValue2";

session.Save(entity);
int lastInsertId = (int)session.GetIdentifier(entity);

transaction.Commit();
session.Close();