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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 updates several Microsoft SQL Server databases within a single transaction.
You need to ensure that after a resource failure, you can manage unresolved transactions. What should
you do?

A) Call the EnlistVolatile method of the Transaction class.
B) Call the EnlistDurable method of the Transaction class.
C) Call the RecoveryComplete method of the TransactionManager class.
D) Call the Reenlist method of the TransactionManager class.

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.
You use the ADO.NET Entity Framework to manage persistence-ignorant entities. You create an
ObjectContext instance named context.
Then, you directly modify properties on several entities. You need to save the modified entity values to the
database.
Which code segment should you use?

A) context.SaveChanges(SaveOptions.DetectChangesBeforeSave);
B) context.SaveChanges(SaveOptions.None);
C) context.SaveChanges();
D) context.SaveChanges(SaveOptions.AcceptAllChangesAfterSave);

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

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to two different Microsoft SQL Server 2008 database servers named Server1 and
Server2.
A string named sql1 contains a connection string to Server1. A string named sql2 contains a connection
string to Server2.
01 using (TransactionScope scope = new
02 ...
03 )
04 {
05 using (SqlConnection cn1 = new SqlConnection(sql1))
06 {
07 try{
08 ...
09 }
10 catch (Exception ex)
11 {
12 }
13 }
14 scope.Complete();
15 }
You need to ensure that the application meets the following requirements:
-There is a SqlConnection named cn2 that uses sql2.
-The commands that use cn1 are initially enlisted as a lightweight transaction.
The cn2 SqlConnection is enlisted in the same TransactionScope only if commands executed by cn1 do not
throw an exception.
What should you do?

A) Insert the following code segment at line 02.
TransactionScope(TransactionScopeOption.Suppress)
Insert the following code segment at line 08.
cn1.Open();
...
using (SqlConnection cn2 = new SqlConnection(sql2))
{
try
{
cn2.Open();
...
}
catch (Exception ex){}
}
B) Insert the following code segment at line 02.
TransactionScope(TransactionScopeOption.RequiresNew)
Insert the following code segment at line 08.
cn1.Open();
...
using (SqlConnection cn2 = new SqlConnection(sql2))
{
try
{
cn2.Open();
...
}
catch (Exception ex){}
}
C) Insert the following code segment at line 02.
TransactionScope(TransactionScopeOption.RequiresNew)
Insert the following code segment at line 08.
using (SqlConnection cn2 = new SqlConnection(sql2)) {
try{
cn2.Open();
...
cn1.Open();
...
}
catch (Exception ex){}
}
D) Insert the following code segment at line 02.
TransactionScope(TransactionScopeOption.Suppress)
Insert the following code segment at line 08.
using (SqlConnection cn2 = new SqlConnection(sql2))
{
try
{
cn2.Open();
...
cn1.Open();
...
}
catch (Exception ex){}
}

5. You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to develop an application that uses the
Entity Framewok.
You need to execute custom logic when an entity is attached to the ObjectContext. What should you do?

A) Create an event handler to handle the ObjectMaterialized event.
B) Create a partial method named OnAttached in the partial class for the entity.
C) Create an event handler to handle the ObjectStateManagerChanged event.
D) Create a partial method named OnStateChanged in the partial class for the entity.

Solutions: