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beyond being escrow agents Because Alice and Bob trust Trent, they may be able to conduct certain types of transactions that they could not have accomplished otherwise To illustrate another example in which Alice and Bob use the help of Trent, consider that Alice might want to sign a contract to be employed by Bob Alice might want Trent to serve as a judge so that if Bob ever tries to pay her less than the salary specified by the contract, she can call on Trent to help enforce the contract At the same time, Bob might not want Alice to show the employment contract to another potential employer to try to get a higher offer Alice and Bob can accomplish both of their goals by using Trent s help Bob can give Trent the employment contract.

If String.IsNullOrEmpty(activity.FromAddress) Then Errors.Add(New ValidationError("No from email address", 1)) ElseIf Not activity.ToAddress.Contains("@") Then Errors.Add(New ValidationError("Invalid from email address", 2)) End If Finally, add code to compile the list of errors, throw an exception if there are errors, and either way return the collection: If Errors.HasErrors Then Dim ErrorsMessage As String = String.Empty For Each validationError As ValidationError In Errors ErrorsMessage = ErrorsMessage + String.Format("Validation error: Number{0}-'{1} ", validationError.ErrorNumber, validationError.ErrorText) Next Throw New InvalidOperationException(ErrorsMessage) End If Return Errors The completed class code looks like this: Public Class SendEmailVBValidator Inherits System.Workflow.ComponentModel.Compiler.ActivityValidator Public Overrides Function ValidateProperties(ByVal manager As ValidationManager, ByVal obj As Object) As ValidationErrorCollection Dim Errors As New ValidationErrorCollection Dim activity As SendEmailVB = TryCast(obj, SendEmailVB) If activity IsNot Nothing Then If String.IsNullOrEmpty(activity.ToAddress) Then Errors.Add(New ValidationError("No To email address", 1)) ElseIf Not activity.ToAddress.Contains("@") Then Errors.Add(New ValidationError("Invalid To email address", 2)) End If If String.IsNullOrEmpty(activity.From) Then Errors.Add(New ValidationError("No from email address", 1)) ElseIf Not activity.ToAddress.Contains("@") Then Errors.Add(New ValidationError("Invalid from email address", 2)) End If If Errors.HasErrors Then Dim ErrorsMessage As String = String.Empty For Each validationError As ValidationError In Errors ErrorsMessage = ErrorsMessage + String.Format("Validation error: Number{0}-'{1} ",validationError.ErrorNumber, validationError.ErrorText) Next

Trent tells Alice the amount of the offer, and agrees not to show the employment contract to other employers Then, Alice can decide whether to accept the contract, but will not be able to use it to negotiate higher offers with other employers Also, if Bob ever tries to cheat Alice by not issuing payment, Trent can intervene Note that we assume that Trent is trusted to be impartial and will not collude with either Alice or Bob To summarize, trusted third parties can help conduct non-repudiable transactions In general, non-repudiation protocols in the world of security are used to ensure that two parties cannot deny that they interacted with each other In most non-repudiation protocols, as Alice and Bob interact, various sets of evidence, such as receipts, are generated The receipts can be digitally signed statements that can be shown to Trent to prove that a transaction took place.

on user interaction. You investigated XML data, with the XMLDataProvider implementing XML data islands as well as referencing external XML files, be they on the file system or at a distant URL. Additionally, I outlined the powerful ObjectDataProvider. This is an enormously powerful tool for your toolbox, where you can build your own types using the ObservableCollection interface in .NET 2.0 and bind your XAML GUI to them. A great scenario for this is in building middleware; you can expose your data resources as custom types, collected into an ObservableCollection, and then define this as a data source to which your GUI elements can bind. By now you should have the confidence and ability to determine the key differences between developing in XAML and traditional Windows forms. You have the tools and the knowledge to go out and build the next generation of forms-based UI applications. In the next chapter, you ll learn about some of the powerful new multimedia features of WPF that allow you to use graphics, video, and other media in your applications.

Unfortunately, while non-repudiation protocols sound desirable in theory, they end up being very expensive to implement, and are not used often in practice..

Throw New InvalidOperationException(ErrorsMessage) End If End If Return Errors End Function Open the SendEmailVB project and the SendEmailVB.vb file. You now must add an attribute to the class to tie the class with the Validator class. Make sure you have the underscore (_) at the end of the line: <ActivityValidator(GetType(SendEmailVBValidator))> _ Public Class SendEmailVB Inherits System.Workflow.ComponentModel.Activity To test the validator, open the VBSendEmailTest project and click the properties of the SendEmailVB activity. Blank out the From property. Build the solution, and the build will fail with an error message that the From e-mail address hasn t been provided.

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