SPWebApplication.Update method

  Name Description
Public method Update() Causes the Web application to serialize its state and propagate changes throughout the server farm. (Overrides SPPersistedObject.Update().)
Public method Update(Boolean) Causes the object to save its state and propagate changes to all the computers in the server farm, optionally throwing an exception if the object already exists in the configuration store. (Inherited from SPPersistedObject.)