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I'm currently writing an ASP.Net app from the UI down. I'm implementing an MVP architecture because I'm sick of Winforms and wanted something that had a better separation of concerns. So with MVP, the Presenter handles events raised by the View. Here's some code that I have in place to deal with the creation of users: public class CreateMemberPresenter { private ICreateMemberView view; private IMemberTasks tasks; public CreateMemberPresenter(ICreateMemberView view) : this(view, new StubMemberTasks()) { } public CreateMemberPresenter(ICreateMemberView view, IMemberTasks tasks) { this.view = view; this.tasks = tasks; HookupEventHandlersTo(view); } private void HookupEventHandlersTo(ICreateMemberView view) { view.CreateMember += delegate { CreateMember(); }; } private void CreateMember() { if (!view.IsValid) return; try { int newUserId; tasks.CreateMember(view.NewMember, out newUserId); view.NewUserCode = newUserId; view.Notify(new NotificationDTO() { Type = NotificationType.Success }); } catch(Exception e) { this.LogA().Message(string.Format("Error Creating User: {0}", e.Message)); view.Notify(new NotificationDTO() { Type = NotificationType.Failure, Message = "There was an error creating a new member" }); } } } I have my main form validation done using the built in .Net Validation Controls, but now I need to verify that the data sufficiently satisfies the criteria for the Service Layer. Let's say the following Service Layer messages can show up: E-mail account already exists (failure) Refering user entered does not exist (failure) Password length exceeds datastore allowed length (failure) Member created successfully (success)

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