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

2. You use Microsoft .NET Framework 4.0 to develop an application that exposes a WCF Data Services
endpoint.
The endpoint uses an authentication scheme that requires an HTTP request that has the following header
format.
GET /OData.svc/Products(1)
Authorization: WRAP access_token "123456789"
You add the following method to your DataService implementation.
01 protected override void OnStartProcessingRequest(ProcessRequestArgs args)
02 {
03 ....
04 }
You need to ensure that the method retrieves the authentication token. Which line of code should you use?

A) string token = args.OperationContext.ResponseHeaders["Authorization"];
B) string token = args.OperationContext.RequestHeaders["Authorization"];
C) string token = args.OperationContext.RequestHeaders["WRAP access_token"];
D) string token = args.OperationContext.ResponseHeaders["WRAP access_token"];

3. 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 application allows users to make changes to entities while disconnected from the central data store.
You need to ensure that when the user connects to the central data store and retrieves new data, the application meets the following requirements:
-Changes made to the local data store in disconnected mode are preserved.
-Entities that have already been loaded into the local data store, but have not been modified by the user,
are updated with the latest data. What should you do?

A) Call the query's Execute method by using the MergeOptions.AppendOnly option.
B) Call the query's Execute method by using the MergeOptions.OverwriteChanges option.
C) Call the Refresh method of ObjectContext by using the RefreshMode.ClientWins option.
D) Call the Refresh method of ObjectContext by using the RefreshMode.StoreWins option.

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
Entity types in the model are generated by the Entity Data Model generator tool (EdmGen.exe).
You write the following code. (Line numbers are included for reference only.)
01 MemoryStream stream = new MemoryStream();
02 var query = context.Contacts.Include("SalesOrderHeaders.SalesOrderDetails");
03 var contact = query.Where("it.LastName = @lastname", new ObjectParameter
("lastname", lastName)).First();
04 ....
You need to serialize the contact and all of its related objects to the MemoryStream so that the contact can
be deserialized back into the model.
Which code segment should you insert at line 04?

A) var formatter = new XmlSerializer(typeof(Contact)); formatter.Serialize(stream, contact);
B) var formatter = new SoapFormatter(); formatter.Serialize(stream, contact);
C) var formatter = new BinaryFormatter(); formatter.Serialize(stream, contact);
D) var formatter = new XmlSerializer(typeof(Contact), new Type[] { typeof(SalesOrderHeader), typeof(SalesOrderDetail)
});
formatter.Serialize(stream, contact);

5. You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL.
The Product entity in the LINQ to SQL model contains a field named Productlmage. The Productlmage field
holds a large amount of binary data.
You need to ensure that the Productlmage field is retrieved from the database only when it is needed by the
application. What should you do?

A) When the context is initialized, specify that the Productlmage property should not be retrieved by using DataLoadOptions
B) Set the Update Check property on the Productlmage property of the Product entity to Never.
C) Set the Delay Loaded property on the Productlmage property of the Product entity to True.
D) Set the Auto-Sync property on the Productlmage property of the Product entity to Never.

Solutions: