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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 connects to a Microsoft SQL Server database. You create the classes shown in the following exhibit:

You add the following code segment to the application. (Line numbers are included for reference only.)
01 public void QueryPlayers (List <League> leagues) {
02 ...
03 }
You create a LINQ query to retrieve a collection of Player objects.
You need to ensure that the collection includes all the players from each team and every league. Which
code segment should you insert at line 02?

A) var query = leagues.Select(l => l.Teams.Select(t => t.Players));
B) var query = leagues.Select(l => l.Teams.SelectMany(t => t.Players));
C) var query = leagues.SelectMany(l => l.Teams.SelectMany(t => t.Players));
D) var query = leagues.SelectMany(l => l.Teams.Select(t => t.Players));

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use the ADO.NET Entity Framework to model your entities.
The application connects to a Microsoft SQL Server 2008 database named AdventureWorks by using
Windows Authentication.
Information about the required Entity Data Model (EDM) is stored in the following files:
-model.csdl
-model.ssdl
-model.msl
These files are embedded as resources in the MyCompanyData.dll file.You need to define the connection
string
that is used by the application. Which connection string should you add to the app.config file?

A) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.ssdl| res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.msl; provider=System.Data.EntityClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=True;multipleactivesuitsets=true'"
providerName="System.Data.SqlClient"/>
B) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Datamodel.csdl| res://MyCompany.Data.model.ssdl| res://MyCompany.Data.model.msl; provider=System.Data.SqlClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=SSPI;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>
C) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl
res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/model.ssdIl
res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/model.msl;
provider=System.Data.OleDBClient;
provider connection string='Provider=sqloledb;DataSource=localhost;Initial
Catalog=AdventureWorks;lntegrated Security=SSPI;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>
D) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.ssdl| res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.msl; provider=System.Data.SqlClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=True;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to several SQL Server databases. You create a function that modifies customer
records that are stored in multiple databases.
All updates for a given record are performed in a single transaction. You need to ensure that all transactions
can be recovered. What should you do?

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

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You create a Database Access Layer (DAL) that is database-independent. The DAL includes the following
code segment.
(Line numbers are included for reference only.)
01 static void ExecuteDbCommand(DbConnection connection)
02 {
03 if (connection != null){
04 using (connection){
05 try{
06 connection.Open();
07 DbCommand command = connection.CreateCommand();
08 command.CommandText = "INSERT INTO Categories (CategoryName)
VALUES ('Low Carb')";
09 command.ExecuteNonQuery();
10 }
11 ...
12 catch (Exception ex){
13 Trace.WriteLine("Exception.Message: " + ex.Message);
14 }
15 }
16 }
17 }
You need to log information about any error that occurs during data access.
You also need to log the data provider that accesses the database. Which code segment should you insert
at line 11?

A) catch (DbException ex){ Trace.WriteLine("ExceptionType: " + ex.Source);
Trace.WriteLine("Message: " + ex.Message);
}
B) catch (OleDbException ex){ Trace.WriteLine("ExceptionType: " + ex.Source);
Trace.WriteLine("Message: " + ex.Message);
}
C) catch (OleDbException ex){ Trace.WriteLine("ExceptionType: " + ex.InnerException.Source);
Trace.WriteLine("Message: " + ex.InnerException.Message);
}
D) catch (DbException ex){ Trace.WriteLine("ExceptionType: " + ex.InnerException.Source);
Trace.WriteLine("Message: " + ex.InnerException.Message);
}

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 database.
The application uses a DataTable named OrderDetailTable that has the following columns:
-ID
-OrderID
-ProductID
-Quantity
-LineTotal
Some records contain a null value in the LineTotal field and 0 in the Quantity field. You write the following code segment. (Line numbers are included for reference only.)
01 DataColumn column = new DataColumn("UnitPrice", typeof(double));
02 ...
03 OrderDetailTable.Columns.Add(column);
You need to add a calculated DataColumn named UnitPrice to the OrderDetailTable object.
You also need to ensure that UnitPrice is set to 0 when it cannot be calculated.
Which code segment should you insert at line 02?

A) column.Expression = "if(Quantity > 0, LineTotal/Quantity, 0)";
B) column.Expression = "LineTotal/ISNULL(Quantity, 1)";
C) column.Expression = "LineTotal/Quantity";
D) column.Expression = "iif(Quantity > 0, LineTotal/Quantity, 0)";

Solutions: