Topcerts 70-648 120q&a

Product DescriptionExam Number/Code: 70-648
Exam Name: TS:Upgrading MCSA on Wndws Serv 2003 to Wndws Serv 2008

“TS:Upgrading MCSA on Wndws Serv 2003 to Wndws Serv 2008″, also known as 70-648 exam, is a Microsoft certification. With the complete collection of questions and answers, Passguide has assembled to take you through 120 Q&As to your 70-648 Exam preparation. In the 70-648 exam resources, you will cover every field and category in TS helping to ready you for your successful Microsoft Certification.

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QUESTION 1
You develop a Windows-based inventory management application that interacts
with a Microsoft SQL Server database. Your application enables users to update
information about items in inventory. Each time a user changes an inventory item,
your application executes a SQL Server stored procedure Certkiller SP to update
rows in the database. Certkiller SP will run many times during each user session.
Your application will use a SqlCommand object to execute Certkiller SP. You must
revise your code so that the use of this object optimizes query performance.
What should you do?
A. Call the SqlCommand.DeriveParameters method before each call to
SqlCommand.ExecuteNonQuery.
B. Call the SqlCommand.Prepare method before each call to
SqlCommand.ExecuteNonQuery.
C. Call the SqlCommand.DeriveParameters method before the first call to
SqlCommand.ExecuteNonQuery.
D. Call the SqlCommand.Prepare method before the first call to
SqlCommand.ExecuteNonQuery.
Answer: D
Explanation: The SqlCommand.Prepare Method creates a prepared version of the
command on an instance of SQL Server. It prepares a compiled version of the
command on the data source. We only need to compile the stored procedure once.
Compiling the procedure would improve performance since it will run many times.

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Note: Deriving parameter information does require an added trip to the data source for
the information. If parameter information is known at design-time, you can improve the
performance of your application by setting the parameters explicitly.
Reference:
.NET Framework Developer’s Guide, Using Stored Procedures with a Command [C#]
.NET Framework Class Library, SqlCommandBuilder.DeriveParameters Method [C#]
.NET Framework Class Library, SqlCommand.Prepare Method [C#]
Incorrect Answers
A, C: We cannot be sure that the parameters are known at design time. So we cannot use
the DeriveParameters method.
B: We don’t need to prepare (compile) the stored procedure before each call.
QUESTION 2
You develop a Windows-based application CertK iApp by using Visual Studio .NET.
CertK iApp uses a SqlConnection object for database access.
You typically run CertK iApp on a computer that has limited RAM and hard disk
space. After the code finishes using the SqlConnection object, you must ensure that
the connection is closed and that any resources consumed by the object are released
immediately.
What should you do?
A. Call the Finalize method of the SqlConnection object.
B. Call the Dispose method of the SqlConnection object.
C. Set the SqlConnection object equal to Nothing.
D. Set the SqlConnection object equal to “”.
Answer: B
Explanation:
SqlConnection.Dispose Method releases the unmanaged resources used by the
SqlConnection and optionally releases the managed resources. Calling this method
with Dispose release both managed and unmanaged resources.
Reference: .NET Framework Class Library, SqlConnection.Dispose Method (Boolean)
[C#]
Incorrect Answers
A: The Finalize method invokes Dispose method but only the only unmanaged resources
are released.
C, D: This is not the way to release the resources used by the SqlConnection object.
QUESTION 3
You develop a Windows-based application that contains a class named
Certkiller Contact. Certkiller Contact used ADO.NET to interact with a Microsoft
SQL Server database. Certkiller Contact requires an active connection to the
database while it is being consumed.

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You must ensure that all resources used by Certkiller Contact are properly releases
as soon as the class stops being consumed.
What should you do?
A. In Contact, create a Sub procedure named Finalize to override System.Object.Finalize.
Place the appropriate cleanup code in the Finalize procedure and call MyBase.Finalize.
B. In Contact, create a Sub procedure named Closed.
Place the appropriate cleanup code in the Closed procedure.
C. Implement the Dispose method of the IDisposable interface.
Place the appropriate cleanup code in the implemented Dispose method.
Call the Dispose method of your form before releasing the reference.
D. Implement the Finalize method if the System.Windows.Form interface.
Place the appropriate cleanup code in the implemented Finalize method.
Call the Dispose method of your form before releasing the reference.
Answer: C
Explanation: We implement the IDisposable interface. It has one method Dispose.
We implement the Dispose method to release the open database connections. We
must explicitly call Dispose method when the resources should be released.
Reference:
Visual Basic and Visual C# Concepts, Initialization and Termination of Components
.NET Framework Developer’s Guide, Overriding the Finalize Method
Incorrect Answers
A, D: As a good practice an object’s Finalize method should not call a method on any
objects other than that of its base class. It is inappropriate to close database in the
Finalize method of the form.
B: A forms closed event occurs when the form is closed. Cleanup code should not be
placed in procedure named Closed. We could not be absolutely sure that the database is
no longer used.
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