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Exam : Microsoft 70-504VB
Title : TS: Microsoft .NET Framework 3.5 -C Windows Workflow Foundation


1. A windows application invokes a workflow that performs complex calculations. When the calculation is done, the workflow returns the calculated value to the windows application, which must display the calculated value in a textbox control, as follows:
pubic sub showData(value as string)
mytextBox.Text = value
End Sub
You need to ensure the workflow updates the value in the textbox control.
What should you do?
A. Have the workflow directly call ShowData() method.
B. Have the workflow call a method in an interface decorated with an
<ExternalDataExchange()> attribute that invokes the ShowData() method directly
C. Set the workflow to call a method in an interface decorated with an <ExternalDataEventArg()> attribute that invokes the ShowData() method directly
D. Set the workflow to call a method in a interface decorated with an <ExternalDataExchange()> attribute that invokes the ShowData() method indirectly through a delegate if the this.InvokedRequired condition is true.
Answer: D

2. You are writing a sequential console workflow that consists of a delay activity and a code activity, as shown in the exhibit. (Click the Exhibit button for the sequential console workflow image.)
In the execution code of the second activity, you try to modify the workflow as follows:
Private Sub delayActivity_InitializeTimeoutDuration(ByVal sender As System.Object, ByVal e As System.EventArgs)
Console.Title = "Modifiability of a Workflow"
Console.WriteLine("Wait ...")
End Sub
Private Sub codeActivity_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim delay As DelayActivity = CType(sender, DelayActivity)
Console.WriteLine(delay.Name)
Dim workflowChanges As New WorkflowChanges(Me)
Dim codeActivity As New CodeActivity()
codeActivity.Name = "codeActivity2"
AddHandler codeActivity.ExecuteCode, AddressOf Me.codeActivity2_ExecuteCode
workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Me.ApplyWorkflowChanges(workflowChanges)
End Sub
Private Sub codeActivity2_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim codeActivity As CodeActivity = CType(sender, CodeActivity)
Console.WriteLine(codeActivity.Name)
Console.ReadLine()
End Sub
You also have set the modifiability of the workflow to a code condition that is set to the following function:
Private Sub UpdateCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs)
if (TimeSpan.Compare(Me.delayActivity.TimeoutDuration, New TimeSpan(0, 0, 5)) > 0) Then
e.Result = False
else
e.Result = True
End If
End Sub
Which code segment should you use to handle the exception?
A. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As ArgumentOutOfRangeException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
B. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As InvalidProgramException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
C. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As InvalidOperationException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
D. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As OverflowException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
Answer: C

3. You create an application in which users design simple sequential workflows. The designs are stored as XOML in a SQL database. You need to start one of these sequential workflows from within your own workflow.
What should you do?
A. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of the WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the workflowType parameter.
B. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the XmlReader and workflowDefinitionReader parameters.
C. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of the WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the workflowType, Dictionary<string,Object> namedArgumentValues, and Guid instanceId parameters.
D. Include and configure an InvokeWorkflow activity
Answer: B

4. You use a built-in tracking service to track specific workflow parameters.
You need to check whether the workflow parameters have been stored in the tracking database.
What should you do? (Each correct answer presents part of a solution. Choose two.)
A. Display the contents of the WorkflowInstance table of the tracking database.
B. Include the SqlTrackingQuery class in a code segment to retrieve tracked workflows and SqlTrackingWorkflowInstance class to inspect them.
C. Use the ActivityTrackingLocation class to determine if the value has been set to a database.
D. Display the contents of the TrackingDataItem table of the tracking database.
Answer: BD

5. You create a Windows Workflow Foundation application by using Microsoft .NET Framework 3. You use the state machine workflow in the application.
You plan to implement a mechanism that allows a host application to query a state machine workflow instance that is currently executing.
You write the following code segment. (Line numbers are included for reference only.)
01 Dim runtime As New WorkflowRuntime()
02 Dim instance As WorkflowInstance = _
03 runtime.CreateWorkflow(GetType(Workflow1))
04 instance.Start()
05
You need to identify the current state of the workflow.
Which code segment should you insert at line 05?
A. Dim currentstate As String = instance.GetWorkflowDefinition().ToString
B. Dim currentstate As String = _
instance.GetWorkflowDefinition().ExecutionStatus.ToString
C. Dim smwi As New StateMachineWorkflowInstance(runtime, _
instance.InstanceId)
Dim currentstate As String = smwi.StateHistory(0)
D. Dim smwi As New StateMachineWorkflowInstance(runtime, _
instance.InstanceId)
Dim currentstate As String = smwi.CurrentStateName
Answer: D