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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.
You use Plain Old CLR objects (POCO) to model your entities.
The application communicates with a Windows Communication Foundation (WCF) Data Services service.
You need to ensure that entities can be sent to the service as XML. What should you do?

A) Apply the [DataContract(IsReference = true)] attribute to the entities.
B) Apply the [Serializable] attribute to the entities.
C) Apply the virtual keyword to the entity properties.
D) Apply the [DataContract(IsReference = false)] attribute to the entities.

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

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. The configuration file contains the following code segment.
<configuration> <connectionStrings> <add name="AdventureWorksLT" connectionString="DataSource=SQL01;InitialCatalog=AdventureWorksLT; IntegratedSecurity=True;" providerName="System.Data.SqlClient"/> </connectionStrings> </configuration>
You need to retrieve the connection string named AdventureWorksLT from the configuration file. Which line of code should you use?

A) varconnectionString=ConfigurationManager.ConnectionStrings["AdventureWorksLT"].Name;
B) varconnectionString=ConfigurationManager.ConnectionStrings["AdventureWorksLT"].ConnectionString;
C) varconnectionString=ConfigurationSettings.AppSettings["AdventureWorksLT"];
D) varconnectionString=ConfigurationManager.AppSettings["AdventureWorksLT"];

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

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
The application has an entity model that includes SalesTerritory and SalesPerson entities as shown in the
following diagram.

You need to calculate the total bonus for all sales people in each sales territory. Which code segment should you use?

A) model.SalesTerritories .GroupBy(territory => territory.SalesPersons) .SelectMany(group => group.Key) .Sum(person => person.Bonus);
B) from person in model.SalesPersons group person by person.SalesTerritory into territoryByPerson select new {
SalesTerritory = territoryByPerson.Key,
TotalBonus = territoryByPerson.Sum(person => person.Bonus)
};
C) model.SalesPersons .GroupBy(person => person.SalesTerritory) .SelectMany(group => group.Key.SalesPersons) .Sum(person => person.Bonus);
D) from territory in model.SalesTerritories group territory by territory.SalesPerson into personByTerritories select new {
SalesTerritory = personByTerritories.Key,
TotalBonus = personByTerritories.Key.Sum(person => person.Bonus)
};

Solutions: