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You can derive a custom collection from ObservableCollection to customize the way it works, but that s not necessary. In the current example, it s enough to replace the List(Of Product) object with an ObservableCollection(Of Product), as shown here: Public Function GetProducts() As List(Of Product) Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("GetProducts", con) cmd.CommandType = CommandType.StoredProcedure Dim products As New ObservableCollection(Of Product)() ... The return type can be left as List(Of Product), because the ObservableCollection class derives from the List class. To make this example just a bit more generic, you could use ICollection(Of Product) for the return type, because the ICollection interface has all the members you need to use.

Listing 3-3. Required Comment Check-in Policy [C#] using System; using System.Windows.Forms; using Microsoft.TeamFoundation.VersionControl.Client; [Serializable] public class CheckForCommentsPolicy : PolicyBase { public override string Description { get { return "Remind users to add meaningful comments " + "to their checkins"; } } public override string InstallationInstructions { get { return "To install this policy, follow the " + "instructions in CheckForCommentsPolicy.cs."; } } public override string Type { get { return "Check for Comments Policy"; } } public override string TypeDescription { get { return "This policy will prompt the user to decide whether or not " + "they should be allowed to check in."; } } public override bool Edit(IPolicyEditArgs args) { // no configuration to save return true; } public override PolicyFailure[] Evaluate() { string proposedComment = PendingCheckin.PendingChanges.Comment; if (String.IsNullOrEmpty(proposedComment)) { return new PolicyFailure[] { new PolicyFailure("Please provide some comments " + "about your checkin", this) };

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Now, if you remove or add an item programmatically, the list is refreshed accordingly. Of course, it s still up to you to create the data access code that takes place before the collection is modified for example, the code that removes the product record from the back-end database.

There are many more options available to you when it comes to configuring system event logs, but they are beyond the scope of this chapter. For more information, consult the .NET Framework documentation.

} else { return new PolicyFailure[0]; } } public override void Activate(PolicyFailure failure) { MessageBox.Show("Please provide comments for your checkin.", "How to fix your policy failure"); } public override void DisplayHelp(PolicyFailure failure) { MessageBox.Show("This policy helps you to remember to " + "add comments to your checkins.", "Prompt Policy Help"); } } [VB] Imports System Imports System.Windows.Forms Imports Microsoft.TeamFoundation.VersionControl.Client <Serializable()> _ Public Class CheckForCommentsPolicy Inherits PolicyBase Public Overrides ReadOnly Property Description() As String Get Return "Remind users to add meaningful comments " _ & "to their checkins" End Get End Property Public Overrides Property InstallationInstructions() As String Get Return "To install this policy, follow the " _ & "instructions in CheckForCommentsPolicyVB.vb." End Get Set(ByVal value As String) MyBase.InstallationInstructions = value End Set End Property

All the features you ve learned about with custom objects also work with the ADO.NET disconnected data objects. For example, you could create the same user interface you see in Figure 16-9 but use the DataSet, DataTable, and DataRow on the back end, rather than the custom Product class and the ObservableCollection. To try it, start by considering a version of the GetProducts() method that extracts the same data but packages it into a DataTable: Public Function GetProducts() As DataTable Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("GetProducts", con) cmd.CommandType = CommandType.StoredProcedure Dim adapter As New SqlDataAdapter(cmd) Dim ds As New DataSet() adapter.Fill(ds, "Products") Return ds.Tables(0) End Function You can retrieve this DataTable and bind it to the list in almost the same way you did with the ObservableCollection. The only difference is that you can t bind directly to the DataTable itself. Instead, you need to go through an intermediary known as the DataView. Although you can create a DataView by hand, every DataTable has a ready-made DataView object available through the DataTable.DefaultView property.

OnStart()

s Note This limitation is nothing new. Even in a Windows Forms application, all DataTable data binding

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