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Some of the methods require you to not return just a MembershipUser but a whole MembershipUserCollection, as follows: Public Overrides Function FindUsersByEmail(ByVal emailToMatch As String, ByVal pageIndex As Integer, ByVal pageSize As Integer, <SystemRuntimeInteropServicesOut()> ByRef totalRecords As Integer) As MembershipUserCollection Try Dim matchingUsers As New List(Of SimpleUser) Dim nUserItem As Integer For nUserItem = 0 To CurrentStoreUsersCount - 1 If CurrentStoreUsersItem(nUserItem)Email = emailToMatch Then matchingUsersAdd(CurrentStoreUsersItem(nUserItem)) End If Next Return CreateMembershipCollectionFromInternalList(matchingUsers) Catch ' Do some local error handling Throw End Try End Function For example, the FindUsersByEmail method finds all users with a specific e-mail (which is possible only if you have configured the provider to not require the e-mail to be unique or if you use pattern matching for e-mails through regular expressions) It returns a collection of membership users.

able to be described by the following set of properties known as ACID atomicity, consistency, isolation, and durability: Atomicity: The transaction updates the database only if everything goes well. If not, it leaves the database as before the transaction started (rollback); Consistency: A consistent transaction is one that does not break any rule of the database such as integrity constraints. Practically speaking, if for some reason the transaction violates the database's consistency rule the transaction will be rolled back and the database will be restored to the previous state; Isolation: The transaction will be completely invisible to other transactions until it completes successfully; Durability: When the transaction completes successfully, it will persist into the database and cannot be undone.

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As you build a workflow-enabled application, you will undoubtedly notice that it feels different from building a typical .NET application. For example, up until this point in the text, every code example began by creating a new project workspace (most often a Console Application project) and involved authoring code to represent the program at large. A WF application also consists of custom code; however, in addition, you are building directly into the assembly a model of the business process itself. Another aspect of WF which is quite different from other sorts of .NET applications is that a vast majority of your workflows will be modeled in a declarative manner, using an XML-based grammar named XAML. Much of the time, you will not need to directly author this markup, as the Visual Studio 2010 IDE will do so automatically as you work with the WF designer tools. This is a big change in direction from the previous version of the WF API, which favored using C# code as the standard way to model a workflow.

Therefore, the collection returned from this method is a collection of SimpleUser instances that you use in the back-end store You can create another helper method for mapping this type of collection to a MembershipUserCollection, as follows: Private Function CreateMembershipCollectionFromInternalList( ByVal users As List(Of SimpleUser)) As MembershipUserCollection Dim ReturnCollection As New MembershipUserCollection() For Each user As SimpleUser In users ReturnCollectionAdd(CreateMembershipFromInternalUser(user)) Next.

Note Be aware that the XAML dialect used within WF is not identical to the XAML dialect used for WPF. You will learn about the syntax and semantics of WPF XAML in 27, as unlike WF XAML, it is quite common to directly edit designer-generated WPF XAML.

Return ReturnCollection End Function Finally, the LastActivityDate property stored for every user is used by membership to determine the number of current users online in the application. You have to implement this method in your custom provider through the GetNumberOfUsersOnline method, as follows: Public Overrides Function GetNumberOfUsersOnline() As Integer Dim ret As Integer = 0 For Each user As SimpleUser In CurrentStore.Users If user.LastActivityDate.AddMinutes(Membership.UserIsOnlineTimeWindow) >= DateTime.Now Then ret += 1 End If Next Return ret End Function This method just goes through all users in the store and uses the UserIsOnlineTimeWindow property, which is a property managed through the Membership class and specifies the number of minutes a user is online without any activity. As long as the LastActivityDate with this number of minutes is larger than the current date and time, the user is considered to be online. The LastActivityDate is updated automatically by the different overloads of the GetUser method and the ValidateUser method. Implementing the remaining functions of the provider does not involve any new concepts, and therefore we will skip them. They merely update some values on users and then call the CurrentStore.Save method to save it to the XML file on the file system. You can download the complete implementation of this provider with the source code for the book.

To get you into the workflow mindset, open Visual Studio 2010. From the New Project dialog box, pick a new Workflow Console Application project named FirstWorkflowExampleApp (see Figure 26-1).

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