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Microsoft 70-516 Exam Syllabus Topics:

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

Question 1

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

Question 2

The application populates a DataSet object by using a SqlDataAdapter object.
You use the DataSet object to update the Categories database table in the database. You write the
following code segment.
(Line numbers are included for reference only.)
01 SqlDataAdapter dataAdpater = new SqlDataAdapter("SELECT CategoryID,
CategoryName FROM Categories", connection);
02 SqlCommandBuilder builder = new SqlCommandBuilder(dataAdpater);
03 DataSet ds = new DataSet();
04 dataAdpater.Fill(ds);
05 foreach (DataRow categoryRow in ds.Tables[0].Rows)
06 {
07 if (string.Compare(categoryRow["CategoryName"].ToString(), searchValue,
true) == 0)
08 {
09 ...
10 }
11 }
12 dataAdpater.Update(ds);
You need to remove all the records from the Categories database table that match the value of the
searchValue variable.
Which line of code should you insert at line 09?

A. ds.Tables[0].Rows[categoryRow.GetHashCode()].Delete();
B. ds.Tables[0].Rows.Remove(categoryRow);
C. categoryRow.Delete();
D. ds.Tables[0].Rows.RemoveAt(0);

Question 3

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses LINQ to SQL.
The application contains the following model.

Each region contains a single vendor. Customers order parts from the vendor that is located in their region.
You need to ensure that each row in the Customer table references the appropriate row from the Vendor
table.
Which code segment should you use?

A. SalesDataContext dc = new SalesDataContext("...");
var query = from c in dc.Customers
join v in dc.Vendors on c.Region equals v.Region
select new { Customer = c. Vendor = v };
foreach (var u in query){
u.Vendor.VendorlD = u.Customer.VendorID;
}
dc.SubmitChanges();
B. SalesDataContext dc = new SalesDataContext("...");
var query = from v in dc.Vendors
join c in dc.Customers on v.Region equals c.Region
select new { Vendor = v, Customer = c };
foreach (var u in query){
u.Customer.VendorlD = u.Vendor.VendorlD;
}
dc.SubmitChanges();
C. SalesDataContext dc = new SalesDataContext("...");
var query = from v in dc.Vendors
join c in dc.Customers on v.VendorlD equals c.VendorID
select new { Vendor = v, Customer = c };
foreach (var u in query){
u.Customer.Region = u.Vendor.Region;
}
dc.SubmitChanges();
D. SalesDataContext dc = new SalesDataContext("...");
var query = from c in dc.Customers
join v in dc.Vendors on c.VendorlD equals v.VendorID
select new { Customer = c, Vendor = v };
foreach (var u in query){
u.Vendor.Region = u.Customer.Region;
}
dc.SubmitChanges();

Question 4

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 a transation around the call to the SaveChanges() method and handle the exception by performing a retry.
B. Change the End2 OnDelete proprety of the FK_PartColor association from None to Cascade
C. Change the End1 OnDelete proprety of the FK_PartColor association from None to Cascade
D. In the database, remove the foreign key association between the Parts table and the Colors table, and then update the entity data model.
E. 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.

Question 5

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.
You use the ADO.NET Entity Framework to manage persistence-ignorant entities. You create an
ObjectContext instance named context.
Then, you directly modify properties on several entities. You need to save the modified entity values to the
database.
Which code segment should you use?

A. context.SaveChanges();
B. context.SaveChanges(SaveOptions.AcceptAllChangesAfterSave);
C. context.SaveChanges(SaveOptions.None);
D. context.SaveChanges(SaveOptions.DetectChangesBeforeSave);

Solutions: