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

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 stores encrypted credit card
numbers in the database.
You need to ensure that credit card numbers can be extracted from the database.
Which cryptography provider should you use?

A) MD5CryptoServiceProvider
B) SHA1CryptoServiceProvider
C) AESCryptoServiceProvider
D) DSACryptoServiceProvider

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 uses the ADO.NET Entity
Framework to model entities. The database includes objects based on the exhibit. (Click the Exhibit
button.)
The application includes the following code segment. (Line numbers are included for reference only.)
01 using (AdventureWorksEntities advWorksContext = new AdventureWorksEntities
()){
02 ...
03 }
You need to retrieve a list of all Products from todays sales orders for a specified customer.
You also need to ensure that the application uses the minimum amount of memory when retrieving the list.
Which code segment should you insert at line 02?

A) Contact customer = (from contact in context.Contact.Include ("SalesOrderHeader") select contact).FirstOrDefault(); foreach (SalesOrderHeader order in customer.SalesOrderHeader) {
order.SalesOrderDetail.Load();
if (order.OrderDate.Date == DateTime.Today.Date)
{
foreach (SalesOrderDetail item in order.SalesOrderDetail)
{
Console.WriteLine(String.Format("Product: {0} ", item.ProductID)); } } }
B) Contact customer = (from contact in context.Contact.Include ("SalesOrderHeader.SalesOrderDetail") select contact).FirstOrDefault(); foreach (SalesOrderHeader order in customer.SalesOrderHeader) {
if (order.OrderDate.Date == DateTime.Today.Date)
{
foreach (SalesOrderDetail item in order.SalesOrderDetail)
{
Console.WriteLine(String.Format("Product: {0} ", item.ProductID)); } } }
C) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter("customerId", customerId)).First(); customer.SalesOrderHeader.Load(); foreach (SalesOrderHeader order in customer.SalesOrderHeader) {
order.SalesOrderDetail.Load();
if (order.OrderDate.Date == DateTime.Today.Date)
{
foreach (SalesOrderDetail item in order.SalesOrderDetail) { Console.WriteLine(String.Format("Product: {0} ", item.ProductID)); } } }
D) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter("customerId", customerId)).First(); customer.SalesOrderHeader.Load(); foreach (SalesOrderHeader order in customer.SalesOrderHeader) {
if (order.OrderDate.Date == DateTime.Today.Date)
{
order.SalesOrderDetail.Load();
foreach (SalesOrderDetail item in order.SalesOrderDetail)
{
Console.WriteLine(String.Format("Product: {0} ", item.ProductID)); } } }

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 model entities.
You need to ensure that the model and mapping files are not deployed as application resources. What
should you do?

A) Set the value of the .edmx file's Metadata Artifact Processing property to Copy to Output Directory.
B) Modify the connection string in the application's .config file to refer to the relative path to the .edmx file.
C) Set the value of the .edmx file's Build Action property to Copy to Output.
D) Modify the connection string in the application's .config file to refer to the absolute physical path to the .edmx file.

5. You have a ContosoEntities context object named context and a Color object stored in a variable named color.
You write the following code:
context.Colors.DeleteObject(color); context.SaveChanges();
When the code runs, it generates the following exception:
System.Data.UpdateException: An error occurred while updating the entries. See
the inner exception for detials. --->
System.Data.SqlClient.SqlException: The DELETE satement conflicted with the
REFERENCE constraint "FK_PartColor".
The conflict occurred in database "Contoso", table "dbo.Parts", column
'ColorId'
You need to resolve the exception without negatively impacting the rest of the application. What should you do?

A) Add code before the call to the DeleteObject() method to examine the collection of Part objects associated with the Color object and then assign null to the Color property for each Part object.
B) Change the End2 OnDelete proprety of the FK_PartColor association from None to Cascade
C) In the database, remove the foreign key association between the Parts table and the Colors table, and then update the entity data model.
D) Change the End1 OnDelete proprety of the FK_PartColor association from None to Cascade
E) Add a transation around the call to the SaveChanges() method and handle the exception by performing a retry.

Solutions: