MCSE Self-Paced Training Kit (Exam 70-293): Planning and Maintaining a Microsoft Windows Server 2003 Network Infrastructure

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QUESTION 58:
You use Visual Studio .NET to create a custom control named Certkiller Stats.
Certkiller Stats will operate by periodically polling your network and updating the

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network statistics displayed to each user.
Certkiller Stats contains a Timer control named Timer1. You set the control’s
Interval property to 500 milliseconds. You write code in the Tick event handler for
Timer1 to poll the network status. You also create a procedure named
RedrawControl to update the statistics displayed in Certkiller Stats.
When the form that contains Certkiller Stats is minimized or hidden behind another
window, the control should not consume unnecessary resources by updating the
display. You must ensure that this condition is met. In addition, you want to write
the minimum amount of code needed to finish developing Stats.
Which two actions should you take? (Each correct answer presents part of the
solution. Choose two)
A. Place the following code segment in the Tick event handler for Timer1:
RedrawControl()
B. Place the following code segment in the Tick event handler for Timer1:
Me.Invalidate()
C. Place the following code segment in the Paint event handler for Timer1:
If Me.Visible = True Then Me.Invalidate()
D. Place the following code segment in the Tick event handler for Timer1:
If Me.Visible = True Then Me.Invalidate()
E. Place the following code segment in the Paint event handler for Stats:
RedrawControl(1)
F. Place the following code segment in the Paint event handler for Stats:
Me.Invalidate
Answer: D, E
Explanation:
D: We use the Tick event to test if the form is visible (Me.Visible = True) and then
invalidate the form.
Note: The Invalidates method invalidates a specific region of the control and causes a
paint message to be sent to the control. It will cause the Paint event of the Stats control to
fire.
E: The invalidate method of the form will cause a paint event of the Stats control. We
handle this by adding the RedrawControl() method to the Paint Event of the Stats control.
Reference:
.NET Framework Developer’s Guide, Rendering a Windows Forms Control [Visual
Basic]
.NET Framework Class Library, Control.Invalidate Method () [Visual Basic]
Incorrect Answers
A: We should only use RedrawControl if the form is visible. Furthermore we should put
RedrawControl() in the Paint event handler for stats, not in Tick event for Timer1.
B: We should only use RedrawControl if the form is visible.
C: We should use the Invalidate method in Tick event for Timer1, not in the Paint event
handler for Stats.
Note: The Paint Event is raised by a control every time it needs to update its display.

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F: We should put RedrawControl() in the Paint event handler for stats, not in Tick event
for Timer1.
QUESTION 59:
You use Visual Studio .NET to develop a data entry form for a Windows-based
application. The form will display one record at a time from a database. The form
must include four Button controls. Each control will be used to navigate through the
data in the database.
You decide to create one procedure to handle the Click event for all four controls.
What should you do?
A. Create a control array consisting of four Button controls.
Your code will inspect the Index argument that is passed into the Click event.
B. Create a control array consisting of four Button controls.
Your code will inspect the Index property of the sender parameter of the Click event.
C. Create four individual Button controls.
Create a procedure named NavButtons_Click to handle the Click event for all four
controls by using the AddHandler keyword.
D. Create four individual Button controls.
Create a procedure named NavButtons_Click to handle the Click event for all four
controls by using the Implements keyword.
Answer: C
Explanation: The AddHandler statement is similar to the Handles clause in that
both allow you to specify an event handler that will handle an event. We can use the
AddHandler statement to add the four events to the event handler, the
NavButtons_clock procedure.
Reference:
Visual Basic Language Concepts, AddHandler and RemoveHandler
Visual Basic Concepts, Control Array Changes in Visual Basic .NET
Visual Basic Language Concepts, Implements Keyword
Incorrect Answers
A, B: Control arrays could be used in Visual Basic 6.0, but they are no longer supported
in Visual Basic .NET.
D: The Implements keyword is used to signify that a class member implements a specific
interface. We should not implement an interface in this scenario however. We want to
configure events for an event handler.
QUESTION 60:
You use Visual Studio .NET to create a Windows-based application. The application
includes a form named Certkiller . You implement print functionality in Certkiller by
using the native .NET System Class Libraries.
Certkiller will print a packing list on tractor-fed preprinted forms. The packing list

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always consists of two pages. The bottom margin of page 2 is different from the
bottom margin of page 1.
You must ensure that each page is printed within the appropriate margins.
What should you do?
A. When printing page 2, set the bottom margin by using the PrintPageEventArgs object.
B. When printing page 2, set the bottom margin by using the
QueryPageSettingEventArgs object.
C. Before printing, set the bottom margin of page 2 by using the PrintSetupDialog object.
D. Before printing, set the bottom margin of page 2 by using the PrinterSettings object.
Answer: B
Explanation:
It is possible to print each page of a document using different page settings. You set page
settings by modifying individual properties of the
QueryPageSettingsEventArgs.PageSettings property. Changes made to the PageSettings
affect only the current page, not the document’s default page settings.
The PageSettings Class specifies settings that apply to a single, printed page. It is used to
specify settings that modify the way a page will be printed.
Reference:
.NET Framework Class Library, PrintDocument.PrintPage Event
.NET Framework Class Library, PrintDocument.QueryPageSettings Event [C#]
.NET Framework Class Library, PrintDocument.PrintPage Event [C#]
Incorrect Answers
A: The pageSettings property of PrintPageEventArgs is read only.
C: PrintSetupDialog object cannot be used to specify specific print settings of page 2.
D: The PrinterSettings object sets general Printer properties. It does no apply here.
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