Как правильно вытащить данные из БД ?

void Initialization()
{
    // Create a dependency connection.
    SqlDependency.Start(connectionString, queueName);
}
 
void SomeMethod()
{
    // Assume connection is an open SqlConnection.
 
    // Create a new SqlCommand object.
    using (SqlCommand command=new SqlCommand(
        "SELECT ShipperID, CompanyName, Phone FROM dbo.Shippers",
        connection))
    {
 
        // Create a dependency and associate it with the SqlCommand.
        SqlDependency dependency=new SqlDependency(command);
        // Maintain the reference in a class member.
 
        // Subscribe to the SqlDependency event.
        dependency.OnChange+=new
           OnChangeEventHandler(OnDependencyChange);
 
        // Execute the command.
        using (SqlDataReader reader = command.ExecuteReader())
        {
            // Process the DataReader.
        }
    }
}
 
// Handler method
void OnDependencyChange(object sender,
   SqlNotificationEventArgs e )
{
  // Handle the event (for example, invalidate this cache entry).
}
 
void Termination()
{
    // Release the dependency.
    SqlDependency.Stop(connectionString, queueName);
}