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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. The application uses the ADO.NET Entity
Framework to model entities.
The database includes objects based on the exhibit.
The application includes the following code segment. (Line numbers are included for reference only.)
01 using (AdventureWorksEntities context = new AdventureWorksEntities()){
02 ...
03 foreach (SalesOrderHeader order in customer.SalesOrderHeader){
04 Console.WriteLine(String.Format("Order: {0} ",
order.SalesOrderNumber));
05 foreach (SalesOrderDetail item in order.SalesOrderDetail){
06 Console.WriteLine(String.Format("Quantity: {0} ", item.Quantity));
07 Console.WriteLine(String.Format("Product: {0} ",
item.Product.Name));
08 }
09 }
10 }
You want to list all the orders for a specified customer. You need to ensure that the list contains the following fields:
-Order number
-Quantity of products
-Product name
Which code segment should you insert at line 02?

A) Contact customer = (from contact in context.Contact
include("SalesOrderHeader") select conatct).FirstOrDefault();
B) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter ("customerId", customerId)).First();
C) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter ("@customerId", customerId)).First();
D) context.ContextOptions.LazyLoadingEnabled = true;
Contact customer = (from contact in context.Contact
include("SalesOrderHeader.SalesOrderDetail")
select conatct).FirstOrDefault();

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities. The application includes two
ObjectContext instances named context1 and context2.
You need to persist the changes in both object contexts within a single transaction. Which code segment
should you use?

A) using (TransactionScope scope = new TransactionScope()) { using (TransactionScope scope1 = new TransactionScope (TransactionScopeOption.RequireNew)) {
context1.SaveChanges();
}
using (TransactionScope scope2 = new TransactionScope
(TransactionScopeOption.RequireNew))
{
context2.SaveChanges();
}
}
B) using (TransactionScope scope = new TransactionScope())
{
context1.SaveChanges();
context2.SaveChanges();
}
C) using (TransactionScope scope = new TransactionScope())
{
context1.SaveChanges();
context2.SaveChanges();
scope.Complete();
}
D) using (TransactionScope scope = new TransactionScope()) { using (TransactionScope scope1 = new TransactionScope (TransactionScopeOption.RequireNew))
{
context1.SaveChanges();
scope1.Complete();
}
using (TransactionScope scope2 = new TransactionScope
(TransactionScopeOption.RequireNew))
{
context2.SaveChanges();
scope2.Complete();
}
scope.Complete();
}

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 database. The application stores user names and
passwords in the database.
You need to ensure that users cannot read passwords extracted from the database. What should you do?

A) Encrypt stored passwords by using the RC2CryptoServiceProvider class.
B) Encrypt stored passwords by using the TripleDESCryptoServiceProvider class.
C) Append a random salt to the password by using the RNGCryptoServiceProvider class. Hash stored passwords by using the SHA1CryptoServiceProvider class.
D) Append a random salt to the password by using the RNGCryptoServiceProvider class. Encrypt stored passwords by using the RijndaelManaged class.

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a multi-tier application.
You use Microsoft ADO.NET Entity Data Model (EDM) to model entities.
The model contains entities named SalesOrderHeader and SalesOrderDetail.
For performance considerations in querying SalesOrderHeader, you detach SalesOrderDetail entities from
ObjectContext.
You need to ensure that changes made to existing SalesOrderDetail entities updated in other areas of your
application are persisted to the database.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Re-attach the SalesOrderDetail entities.
B) Set the MergeOption of SalesOrderDetail to MergeOptions.OverwriteChanges.
C) Call ObjectContext.ApplyOriginalValue.
D) Call ObjectContext.ApplyCurrentValue.
E) Set the MergeOption of SalesOrderDetail to MergeOptions.NoTracking.

5. 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 model entities. The model includes the entity
shown in the following exhibit:

You need to add a function that returns the number of years since a person was hired.
You also need to ensure that the function can be used within LINQ to Entities queries. What should you do?

A) //Add the following conceptual model function returns the number of years since an instructor was hired
<Function Name="YearsSince" ReturnType="Edm.Int32">
<Parameter Name="date" Type="Edm.DateTime" />
<DefiningExpression>
YearsSince(DateTime date)
</DefiningExpression>
</Function>
// add the following method to your application and use an EdmFunctionAttribute to map it to the
conceptual model function:
[EdmFunction("SchoolModel", "YearsSince")]
public static int YearsSince(DateTime date){
return CurrentDateTime() -Year(date);
}
B) //Add the following conceptual model function returns the number of years since an instructor was hired
<Function Name="YearsSince" ReturnType="Edm.Int32">
<Parameter Name="date" Type="Edm.DateTime" />
<DefiningExpression>
Year(CurrentDateTime()) -Year(date)
</DefiningExpression>
</Function>
// add the following method to your application and use an EdmFunctionAttribute to map it to the
conceptual model function:
[EdmFunction("SchoolModel", "YearsSince")]
public static int YearsSince(DateTime date){
return CurrentDateTime() -Year(date);
}
C) Use the Entity Data Model Designer to create a complex property named YearsSinceNow that can be accessed throuqh the LINQ to Entites query at a Later time
D) //Add the following conceptual model function returns the number of years since an instructor was hired
<Function Name="YearsSince" ReturnType="Edm.Int32">
<Parameter Name="date" Type="Edm.DateTime" />
<DefiningExpression>
Year(CurrentDateTime()) -Year(date)
</DefiningExpression>
</Function>
// add the following method to your application and use an EdmFunctionAttribute to map it to the
conceptual model function:
[EdmFunction("SchoolModel", "YearsSince")] public static int YearsSince(DateTime date){ throw new NotSupportedException("Direct calls are not supported."); }

Solutions: