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The Typed DataSet used in the previous section was built with an XSD file, which defines the various properties of the DataTables and TableAdapters. This is a fairly rigid model because the XSD file is edited primarily by using Visual Studio and the visual Typed DataSet Designer. It also locks in the database schema, which will most likely change over the life of a project. It can be helpful to use a more flexible option. The stored procedure used by the Typed DataSet can be run directly to get the same columns that will generate a compatible DataSet at runtime. Instead of the columns redundantly being defined by the Typed DataSet and the stored procedure, they can be defined by just the stored procedure. In the same class library, you create a class called PersonDomain and start filling in the code by using the code snippets defined earlier in this chapter. First you add the reference to the Database object and then add the initialization for that reference to the constructor (see Listing 2-8). Listing 2-8. Database Initialization /// <summary> /// This is used as a global connection for database connectivity /// </summary> private Database db; public PersonDomain() { db = DatabaseFactory.CreateDatabase("chpt02"); } Next you add the method in Listing 2-9, which calls the same stored procedure as the Typed DataSet. Listing 2-9. GetAllPeopleDataSet [DataObjectMethod(DataObjectMethodType.Select)] public DataSet GetAllPeopleDataSet() { DataSet ds = new DataSet(); using (DbCommand dbCmd = db.GetStoredProcCommand("chpt02_GetAllPeople")) { ds = db.ExecuteDataSet(dbCmd); } //return the results return ds; }

You can also use MonoDevelop, an open source IDE that also works on Linux and Mac, and strictly speaking you can even just use a plain text editor.

Figure 6 5. The improved product-editing screen That s still fairly basic, but much more usable. Let s now move on to complete the editing functionality.

<UserControl xmlns:sdk="clrnamespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input" xmlns:my="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightTasks.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="400" d:DesignWidth="500"> <Grid x:Name="LayoutRoot" Loaded="LayoutRoot_Loaded"> <sdk:Label Height="25" HorizontalAlignment="Left" Margin="12,0,0,25" Name="lblStatus" VerticalAlignment="Bottom" Width="450" /> <my:DataGrid Name="dgTasks" HorizontalAlignment="Left" Margin="20,20,0,0" VerticalAlignment="Top" Height="325" Width="460" ItemsSource="{Binding Tasks}" /> <Grid.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#1E009100" Offset="0" /> <GradientStop Color="#FFE1FF00" Offset="0.893" /> </LinearGradientBrush> </Grid.Background> </Grid> </UserControl> 5. Next, let s add a folder for Entities, and a class to hold data from the SharePoint task list, as follows add a new file Task.cs that contains:

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If you submit this product editor form, the same form will just reappear, having lost any changes you made to the input fields. That s because the form issues a POST request to the same URL from which it was generated, and that URL invokes the Edit action, and that in turn just renders that same product editor form again. What we must add now is another Edit action, but this time one that specifically catches POST requests and does something more useful with them.

The simple method in Listing 2-9 calls the chpt02_GetAllPeople stored procedure and returns the generated DataSet with all the same columns as the Typed DataSet. The method also includes the DataObjectMethod attribute, which indicates that the associated method acts as a Select method. In addition to this method attribute, an attribute is also placed in the class declaration. For example: [DataObject(true)] public class PersonDomain { ... } The attributes preceding the class and method declarations make these Select methods available to the ObjectDataSource configuration wizard used by the Web Form. Create a new Web Form and repeat the same steps to add the GridView to the page as done for the Typed DataSet. When configuring the ObjectDataSource, select the PersonDomain object and the GetAllPeopleDataSet method. Because the class is marked as a DataObject and the method is marked as a Select method, it is listed. Also, instead of creating a new implementation from scratch, you can add a second ObjectDataSource to the same Web Form as the Typed DataSet by using the newly created class and method. Now you can use the Smart Tag on the GridView to select this new ObjectDataSource. Because the columns are completely compatible, you use either datasource interchangeably. Figure 2-6 shows a databound control with two configured ObjectDataSources.

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