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Microsoft TS: Windows Applications Development with Microsoft .NET Framework 4 Sample Questions:

1. You are developing a Windows Presentation Foundation (WPF) application that displays opportunities from List (Of T) named Leads, where T is a class named Lead. The Lead class contains the properties Title and Revenue.
You add a DataGrid control named dgQualifiedLeads to the MainWindow.xaml file. You set the ItemSource property of dgQualifiedLeads to Leads as follows. (Line numbers are included for reference only.)

You need to ensure that CollectionViewSource is used to filter the list to display only Lead objects with revenue of more than $1,000.
What should you do?

A) Insert the following code at line 22.
Leads.Filter =
New Predicate (Of Object)(AddressOf FilterOut)
Add the following code segment to the code-behind of the MainWindow.xaml file.
Public Function FilterOut(ByVal item As Object) As Boolean
Dim lead As Lead TryCast(item, Lead)
Return IIf(lead.Revenue > 1000D, False, True)
End Function
B) Insert the following code at line 22.
Leads.Filter = New Predicate (Of Object)(AddressOf FilterOut)
Add the following code segment to the code-behind of the MainWindow.xaml file.
Public Function FilterOut(ByVal item As Object) As Boolean
Dim lead As Lead = TryCast(item, Lead)
Return IIf(lead.Revenue < 1000D, True, False)
End Function
C) Insert the following code at line 22.
Leads.Filter =
New Predicate(Of Object)(
Function(s) DirectCast(s. Lead).Revenue > 1000D)
D) Insert the following code at line 22.
Leads.SortDescriptions.Add(New SortDescription(
"Revenue", ListSortDirection.Ascending))

2. You are upgrading the security features of a Microsoft .NET 3.5 application to .NET 4. You need to identify the -NET 3.5 security application programming interface (API) calls that implicitly use code access security (CAS) policies so that you can upgrade the calls.
What should you do?

A) Examine the AppDomain.DefineDynamicAssembly() calls and ensure that they are using fully trusted assemblies,
B) Examine the AppDomain.CreateDomain() calls and ensure that they are using fully trusted assemblies.
C) Look for a SecurityContextSource parameter in the security calls.
D) Look for an Evidence parameter in the security calls.

3. You are developing a Windows Forms application that contains a DataGridView control. The DataGridView is composed of several fields that capture the customer's name, address, and phone number.
You have been asked to provide data validation in a DataGridView to prevent users from leaving the name field if the name field is empty.
You need to ensure that users cannot tab out of the name field without entering data.
What should you do?

A) Validate the name field in the CellValidating event. Set e.Cancel - true if the name field is empty.
B) Validate the name field in the CellEnter event. Set the focus on the name field if the name field is empty.
C) Validate the name field in the CancelRowEdit event. Set the focus on the name field if the name field is empty.
D) Validate the name field in the CellErrorTextChanged event. Get e.RowIndex if the name field is empty.

4. You are developing a Windows Presentation Foundation (WPF) application.
The application has an Image control.
You need to ensure that a portion of the image displays in a circle in the control.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Add an Ellipse element to the control. Use Ellipse.Fill and ImageBrush with the image as ImageSource.
B) Add an Image.Clip element to the control. Use EllipseGeometry within Image.Clip.
C) Add an Image.Clip element to the control. Use LineGeometry within Image.Clip.
D) Add an Ellipse element to the control. Use Ellipse.Stroke and ImageBrush with the image as ImageSource.

5. You are developing a Windows Presentation Foundation (WPF) application.
You build a dictionary that implements INotifyPropertyChanged. You want to use an indexer to bind to the UI. The relevantimplementation of the dictionary is as follows. (Line numbers are included for reference only.)

You need to ensure that the PropertyChanged event is triggered so that the UI is updated if you modify the collection using theindexer.
Which code should you insert at line 17?

A) RaiseEvent PropertyChanged(Me,
New PropertyChangedEventArgs("Item()"))
B) RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("Item"))
C) RaiseEvent PropertyChanged(Me,
New PropertyChangedEventArgs("Me"))
D) RaiseEvent PropertyChanged(Me,
New PropertyChangedEventArgs("Me()"))

Solutions: