This is an interesting challenge. We are still in the process of namespacing and adapting our first DNN agenda items to our web services. After reviewing much of the DNN code you find that there is little in the way of notifications. You create the controller tell it to create the portal and you are done. You do not get any error codes that the function succeed or failed. The assumption is that it worked, otherwise an exception would be thrown. In the Portal Controller class there are no Try..Catch blocks. We are trying to develop a series of error codes to go along with the web services. Since the applications using the web services do not have a state in the matter we need to let them know if they succeed or failed. We will look at using Datasets and Begin/End Trans for the remote calls.
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General, .Net, DotNetNuke