One way methods have the pattern of fire and forget. The OneWayAttribute is used to indicate that the method has a void return and in only parameters. Byref and return values are not supported. The method can execute synch or asynch with respect to the caller. The caller does not make assumptions that the one-way call has executed on the server object when thread control returns.
Attribute for marking methods as one way
namespace System.Runtime.Remoting { [AttributeUsage(AttributeTargets.Method)] public class OneWayAttribute : Attribute { } }