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The following code routine demonstrates an example that specifically searches out invalid data in TextBox objects. It uses recursive code to dig down through the entire element hierarchy. Along the way, the error information is aggregated into a single message that s then displayed to the user. Private Sub cmdOK_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) Dim message As String If FormHasErrors(message) Then ' Errors still exist. MessageBox.Show(message) Else ' There are no errors. You can continue on to complete the task ' (for example, apply the edit to the data source.). End If End Sub Private Function FormHasErrors(ByRef message As String) As Boolean Dim sb As New StringBuilder() GetErrors(sb, gridProductDetails) message = sb.ToString() Return (message <> "") End Function Private Sub GetErrors(ByVal sb As StringBuilder, ByVal obj As DependencyObject) For Each child As Object In LogicalTreeHelper.GetChildren(obj) Dim element As TextBox = CType(child,TextBox) If element Is Nothing Then Continue For End If If Validation.GetHasError(element) Then sb.Append((element.Text & " has errors:" & vbCrLf)) For Each error As ValidationError In Validation.GetErrors(element) sb.Append(" " & error.ErrorContent.ToString()) sb.Append("" & vbCrLf) Next End If ' Check the children of this object for errors. GetErrors(sb, element) Next End Sub In a more complete implementation, the FormHasErrors() method would probably create a collection of objects with error information. The cmdOK_Click() event handler would then be responsible for constructing an appropriate message.

Areas and iterations can be added, deleted, and configured from within Microsoft Project, which displays the same dialogs as described in detail in 2.

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To get the most out of WPF validation, you ll want to create your own error template that flags errors in an appropriate way At first glance, this seems like a fairly low-level way to go about reporting an error after all, a standard control template gives you the ability to customize the composition of a control in minute detail However, an error template isn t like an ordinary control template Error templates use the adorner layer, which is a drawing layer that exists just above ordinary window content Using the adorner layer, you can add a visual embellishment to indicate an error without replacing the control template of the control underneath or changing the layout in your window The standard error template for a text box works by adding a red Border element that floats just above the corresponding text box (which remains unchanged underneath).

SOAP is a powerful XML-based protocol that packages up a method call to be executed, along with any parameters it requires for implementing. This package is then sent using a standard HTTP request to the Web service. Upon the completion of the execution of a method, SOAP packages up any return values and sends them back to the client using a standard HTTP response. The best part of SOAP, at least when it comes to .NET, is you get it for free in almost all cases, and you don't have to know anything about it so long as you code within the Common Language Specification (CLS) specified by .NET. As you will see later in this chapter when I show how to send a DataSet from a Web service to a client, it is possible to transmit fairly complex data objects using SOAP.

You can use an error template to add other details, like images, text, or some other sort of graphical detail that draws attention to the problem The following markup shows an example It defines an error template that uses a green border and adds an asterisk next to the control with the invalid input The template is wrapped in a style rule so that it s automatically applied to all the text boxes in the current window: <Style TargetType="{x:Type TextBox}"> <Setter Property="ValidationErrorTemplate"> <SetterValue> <ControlTemplate> <DockPanel LastChildFill="True"> <TextBlock DockPanelDock="Right" Foreground="Red" FontSize="14" FontWeight="Bold">*</TextBlock> <Border BorderBrush="Green" BorderThickness="1"> <AdornedElementPlaceholder></AdornedElementPlaceholder> </Border> </DockPanel> </ControlTemplate> </SetterValue> </Setter> </Style> The AdornedElementPlaceholder is the glue that makes this technique work It represents the control itself, which exists in the element layer By using the AdornedElementPlaceholder, you re able to arrange your content in relation to the text box underneath.

Finally, a project manager can view column mappings in Microsoft Project. Figure 4-10 shows a column displayed in Microsoft Project and the equivalent column in the VSTS database. You cannot actually make changes to the mapping through this dialog box. In order to make changes you will need to use the TFSFieldMapping command-line tool described next.

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