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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:

1. You are adding a process to the application. The process performs the following actions:
1.Opens a ContosoEntities context object named context1.
2.Loads a Part object into a variable named part1.
3.Calls the Dispose() method on context1.
4.Updates the data in part1.
5.Updates the database by using a new ContosoEntities context object named context2.
You need to update the database with the changed data from part1. What should you do?

A) Add the following code segment before calling SaveChanges() on context2:
context2.ApplyOriginalValues("Parts", part1);
B) Add the following code segment before calling SaveChanges() on context2:
context2.ApplyCurrentValues("Parts", part1);
C) Add the following code segment before calling SaveChanges() on context2:
context2.Attach(part1);
context2.ApplyCurrentValues("Parts", part1);
D) Add the following code segment before calling SaveChanges() on context2:
context2.Attach(part1);
context2.ObjectStateManager.ChangeObjectState(part1,
System.Data.EntitySate.Modified);

2. 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 create an entity as shown in
the following code fragment.
<EntityType Name="ProductCategory">
<Key>
<PropertyRef Name="ProductCategoryID" />
</Key>
<Property Name="ProductCategoryID" Type="int" Nullable="false" StoreGeneraedPattern="Identity" />
<Property Name="ParentProductCategoryID" Type="int" />
<Property Name="Name" Type="nvarchar" Nullable="false" MaxLength="50" />
...
</EntityType>
You need to provide two entity-tracking fields:
-rowguid that is automatically generated when the entity is created
-ModifiedDate that is automatically set whenever the entity is updated. Which code fragment should you add to the .edmx file?

A) <Property Name="rowguid" Type="uniqueidentifier" Nullable="false" StoreGeneratedPattern="Computed"/> <Property Name="ModifiedDate" Type="timestamp" Nullable="false" StoreGeneratedPattern="Identity"/>
B) <Property Name="rowguid" Type="uniqueidentifier" Nullable="false" StoreGeneratedPattern="Identity"/> <Property Name="ModifiedDate" Type="timestamp" Nullable="false" StoreGeneratedPattern="Computed"/>
C) <Property Name="rowguid" Type="uniqueidentifier" Nullable="false" StoreGeneratedPattern="Computed"/> <Property Name="ModifiedDate" Type="timestamp" Nullable="false" StoreGeneratedPattern="Computed"/>
D) <Property Name="rowguid" Type="uniqueidentifier" Nullable="false" StoreGeneratedPattern="Identity"/> <Property Name="ModifiedDate" Type="timestamp" Nullable="false" StoreGeneratedPattern="Identity"/>

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 Data Definition Language (DDL) script of the database contains the following code segment:
CREATE TABLE [Sales].[SalesOrderHeader]( [SalesOrderID] [int] IDENTITY(1,1) NOT NULL, [BillToAddressID] [int] NOT NULL, ... CONSTRAINT [PK_SalesOrderHeader_SalesOrderID] PRIMARY KEY CLUSTERED ([SalesOrderID] ASC) )
ALTER TABLE [Sales].[SalesOrderHeader] WITH CHECK ADD CONSTRAINT [FK_SalesOrderHeader_Address] FOREIGN KEY([BilIToAddressID]) REFERENCES [Person].[Address]([AddressID])
You create an ADO.NET Entity Framework model. You need to ensure that the entities of the model
correctly map to the DDL of the database.
What should your model contain?

A) Option
B) Option
C) Option
D) Option

4. You use Microsoft .NET Framework 4.0 and the Entity Framework to develop an application.
You create an Entity Data Model that has an entity named Customer. You set the optimistic concurrency
option for Customer.
You load and modify an instance of Customer named loadedCustomer, which is attached to an
ObjectContext named context.
You need to ensure that if a concurrency conflict occurs during a save, the application will load up-to-date
values from
the database while preserving local changes. Which code segment should you use?

A) try {
context.SaveChanges();
}
catch(OptimisticConcurrencyException ex)
{
context.Refresh(RefreshMode.StoreWins, loadedCustomer);
}
B) try {
context.SaveChanges();
}
catch(EntitySqlException ex)
{
context.Refresh(RefreshMode.StoreWins, loadedCustomer);
}
C) try {
context.SaveChanges();
}
catch(EntitySqlException ex)
{
context.Refresh(RefreshMode.ClientWins, loadedCustomer);
}
D) try {
context.SaveChanges();
}
catch(OptimisticConcurrencyException ex)
{
context.Refresh(RefreshMode.ClientWins, loadedCustomer);
}

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
You create the following Entity Data Model.

You add the following code fragment:
using(var context = new AdventureWorksLTEntities())
{ Customer cust = context.Customers.First(); cust.CompanyName = "Contoso"; int count = 0;
}
The changes to the cust entity must be saved. If an exception is thrown, the application will attempt to save
up to 3 times.
If not, an exception is thrown. Which code segment should you use?

A) while(context.ObjextStateManager.GetObjectStateEntry (cust).OriginalValues.IsDBNull(0)) {
if(count++ >2)
{
break;
}
context.SaveChanges();
}
B) while(cust.EntityState == EntityState.Modified)
{
try
{
context.SaveChanges();
}
catch(Exception)
{
if(count++ > 2 && context.Connection.State ==
ConnectionState.Broken
{
throw new Exception();
}
}
}
C) while(count++ < 3)
{
try
{
context.SaveChanges();
break;
}
catch(Exception)
{
}
}
D) while(true)
{ context.SavingChanges += delegate(System.Object o, System.EventArgs e) {
if(count++ >2)
{
throw new Exception();
}
context.SaveChanges();
}
}

Solutions: