Programmatically set InstanceContextMode

Question

Is there a way to do this ...

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]

...pro

Answer 1

Even though the original answer contains the solution it is Just a straight answer to the question

ServiceHost host = new ServiceHost(typeof(YourService)); //Or get the Servicehost
((ServiceBehaviorAttribute)host.Description.
Behaviors[typeof(ServiceBehaviorAttribute)]).InstanceContextMode 
= InstanceContextMode.Single;