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As a stateful data format, a DiffGram is particularly useful for building save-and-resume applications. In this context, a save-and-resume application is a desktop or Web application that can work both on line and off line. For such applications, the connection to the rest of the back-end system is optional and is not guaranteed to be up all the time. From the connectivity standpoint, a save-and-resume application is intermittent and must be able to get its core data either remotely (for example, from the central system) or locally (for example, from data persisted to files). In this section, we'll build a Windows Forms application that connects to a database, downloads some data, and disconnects. From this point on, the application works disconnected, the data it needs is stored locally, and the application can be used anywhere and shut down and resumed any number of times. All the changes made to the local data are correctly tracked and reported as insertions, deletions, and updates. At a later time, the application reconnects to the system and submits its changes. In this description, common words such as connection, back-end system, data, database, and updates are treated as blanket terms that each application can implement as needed. For example, a simple query executed on a SQL Server table in the sample application can easily become a call to a middle-tier object. Similarly, a simple connection to SQL Server in the sample application could be viewed as a login in a distributed application. Note While looking at the sample application discussed here, keep in mind that it is just a sample. Focus on the technologies involved and their interactions rather than on the implementation details. The overall context of the sample application, while representative of a common type of application, is certainly not a real-world scenario!

Add-in. Client computers must have the Microsoft Office 2003 Spreadsheet Web Component (owc11.exe) installed. The component is installed by default as part of a Microsoft Office 2003 installation. The Microsoft Office Components for SharePoint Products and Technologies (stspkpl.exe), which include the Office Spreadsheet Web Part must be installed on the server before you can import custom web parts created using the add-in.

Setting Up the Application The key functions of a save-and-resume application can be summarized in three categories. First, the application must be able to work disconnected, thus transparently using a local copy of the back-end database. Next, the application must allow you to review, filter, and reject changes. Finally, the application must allow you to reconnect and submit changes at any time. Figure 10-7 shows the key elements of the architecture.

The Spreadsheet Web Part Add-in is available at no cost from Microsoft. The URL is bulky:

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Figure 10-7: Constituent parts of a disconnected save-and-resume application. At startup, the application loads data either from the local store or from a centralized repository. Applications can determine what route should be taken first according to their own features and requirements. Likewise, they can provide distinct user interface elements to trigger the local and remote downloads independently. The DataSet object is ideal for storing a disconnected database. It can contain multiple, even indexed, tables, as well as relations and constraints. Once rebuilt, the DataSet object is used to populate the user interface, which also provides for editing. In this chapter and in 9 and 11, we examine the various options available for serializing a DataSet object: .NET Framework formatters, the ADO.NET normal form, DiffGrams, and XML serializers. A disconnected application should allow users to accumulate and review changes to the original through several work sessions. This means that the local data store must persist the state of each change and possibly the history of each row. The DataSet object provides for just this situation. The DataSet object is also ideal for gathering all the modified rows to be submitted to the back-end system for permanent updates. The DataSet object has been designed with disconnection in mind and to be used in save-and-resume applications. In saveand-resume scenarios, the serialization of the object is a critical aspect in improving overall client-side performance and efficiency. Creating the Local Data Store The sample application shown in Figure 10-8 is a simple Windows Forms application containing an editable DataGrid control. The grid is bound to a DataSet object that can be obtained by executing a SQL query or by reading a local DiffGram file.

Use the boxes in the Paper source section to specify the printer s paper tray(s) for the first page of the business plan and for the subsequent pages. In the Preview section, opt to apply the changes to the whole document. Click the Print Options button to review the settings, as shown in Figure 2-12. Deselect Draft output if it has been selected. Select Update fields. This tells Word to check that the fields are current when the document prints. Similarly, select Update links. You should also select Drawing objects. Once you have made your selections, click OK. On the Layout tab, check the document s vertical alignment, as shown in Figure 2-13. You want the text aligned to the top of the page, so select Top in the drop-down box. Once again, opt to apply the changes to the whole document. Click OK.

Figure 10-8: The sample save-and-resume application. The code that populates the data grid looks like this: void PopulateGrid() { if (!File.Exists(m_diffgram)) LoadFromDatabase(); else LoadFromLocalStore(); // Load methods fill the m_dataSet internal property grid.DataSource = m_dataSet; grid.DataMember = "Employees"; } Once the data loads, users can start working and enter changes as appropriate. The DataSet object tracks any changes and signals those changes to the application through the HasChanges method. Here's the code to load the data from the local store: private void LoadFromLocalStore() { // Load the schema into the DataSet m_dataSet.ReadXmlSchema(m_schemaFile); // Load the data m_dataSet.ReadXml(m_diffgramFile, XmlReadMode.DiffGram); } The sample application uses a DiffGram to implement the local store. More precisely, the local store consists of two distinct files one for the data (the DiffGram) and one for the schema. As mentioned, a DiffGram can't be used to populate a DataSet object without schema information. This is not your only option, however. You can use the XML serializer to persist a DataSet object to a file that stores schema and data in the same place. In all these cases, the final output format is XML. If you 380

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want a more compact format, opt for the binary NET Framework formatter and consider using a ghost class, as described in 9 Reviewing and Rejecting Changes Users of the sample application enter changes through the interface of the DataGrid control Each change is detected, and controls in the user interface are enabled and disabled to reflect those changes For example, the Review Changes button is enabled if there are changes to review Detecting Ongoing Changes In a Windows Forms application, data sources associated with data-bound controls are managed by a special breed of component the binding manager BindingManagerBase is the abstract class for binding managers; the actual classes you will work with are CurrencyManager and PropertyManager The PropertyManager class keeps track of a simple binding between a data-bound control property and a data source scalar value The CurrencyManager class plays a more sophisticated role.

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