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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:

1. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application uses the ADO.NET Entity Framework to manage Plain Old CLR Objects (POCO) entities.
You create a new POCO class. You need to ensure that the class meets the following requirements:
-It can be used by an ObjectContext.
-It is enabled for change-tracking proxies.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Configure the navigation property to return a type that implements the IEntityWithRelationships interface.
B) Modify each mapped property to contain sealed and protected accessors.
C) Configure the navigation property to return a type that implements the ICollection interface.
D) Configure the navigation property to return a type that implements the IQueryable interface.
E) Modify each mapped property to contain non-sealed, public, and virtual accessors.

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses DataContexts to query
the database.
The application meets the following requirements:
-Stores customer data offline.
-Allows users to update customer records while they are disconnected from the server.
-Enables offline changes to be submitted back to the SQL Server by using the DataContext object.
You need to ensure that the application can detect all conflicts that occur between the offline customer information submitted to the SQL Server and the server version. You also need to ensure that you can roll back local changes. What should you do?

A) Override the Update operation of the DataContext object. Call the ExecuteDynamicUpdate method to generate the update SQL.
B) Call the SubmitChanges method of the DataContext object. Pass System.Data.Linq.ConflictMode.ContinueOnConflict to the method.
C) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch SqlExceptions.
D) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch ChangeConflictExceptions.

3. Which code segment will properly return the TimeSpan returned by the stopWatch variable?

A) Stopwatch stopWatch = new Stopwatch(); stopWatch.Start(); DoSomething(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
B) Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
DoSomething();
stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds,
ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
C) Stopwatch stopWatch = new Stopwatch(); stopWatch.Start(); DoSomething(); stopWatch.Reset(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
D) Stopwatch stopWatch = new Stopwatch(); stopWatch.Begin(); DoSomething(); stopWatch.End(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }

4. You use Microsoft Visual Studio 2010, Microsoft Sync Framework, and Microsoft .NET Framework 4.0 to
create an application.
You have a ServerSyncProvider connected to a Microsoft SQL Server database. The database is hosted on
a Web server.
Users will use the Internet to access the Customer database through the ServerSyncProvider.
You write the following code segment. (Line numbers are included for reference only.)
01 SyncTable customerSyncTable = new SyncTable("Customer");
02 customerSyncTable.CreationOption =
TableCreationOption.UploadExistingOrCreateNewTable;
03 ...
04 customerSyncTable.SyncGroup = customerSyncGroup;
05 this.Configuration.SyncTables.Add(customerSyncTable);
You need to ensure that the application meets the following requirements:
-Users can modify data locally and receive changes from the server.
-Only changed rows are transferred during synchronization. Which code segment should you insert at line 03?

A) customerSyncTable.SyncDirection = SyncDirection.Snapshot;
B) customerSyncTable.SyncDirection = SyncDirection.Bidirectional;
C) customerSyncTable.SyncDirection = SyncDirection.DownloadOnly;
D) customerSyncTable.SyncDirection = SyncDirection.UploadOnly;

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database. The application contains two
SqlCommand objects named cmd1 and cmd2.
You need to measure the time required to execute each command. Which code segment should you use?

A) Stopwatch w1 = new Stopwatch(); w1.Start(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Reset(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
B) Stopwatch w1 = new Stopwatch(); w1.Start(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Start(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
C) Stopwatch w1 = Stopwatch.StartNew(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1 = Stopwatch.StartNew(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
D) Stopwatch w1 = Stopwatch.StartNew(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Start(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);

Solutions: