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

1. 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) 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 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.

2. A performance issue exists in the application. The following code segment is causing a performance bottleneck:
var colors = context.Parts.GetColors();
You need to improve application performance by reducing the number of database calls. Which code segment should you use?

A) var colors = context.Parts.OfType<Product>().Include ("Parts.Color").GetColors();
B) var colors = context.Parts.OfType<Product>().Include ("Product.Color").GetColors();
C) var colors = context.Parts.OfType<Product>().Include("Color").GetColors();
D) var colors = context.Parts.OfType<Product>().Include("Colors").GetColors();

3. You use Microsoft Visual Studio 2010 and the Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses DataContexts to query
the database.
You define a foreign key between the Customers and Orders tables in the database.
You need to ensure that when you delete a customer record, the corresponding order records are deleted.
You want to achieve this goal by using the minimum amount of development effort. What should you do?

A) Use the ExecuteDynamicDelete method of the DataContext object.
B) Modify the foreign key between the Customers and Orders tables to enable the ON DELETE CASCADE option.
C) Override the Delete operation of the customer entity.
D) Remove the foreign key between the Customers and Orders tables.

4. You need to write a LINQ query that can be used against a ContosoEntities context object named context to
find all
parts that have a duplicate name. Which of the following queries should you use?
(Each correct answer presents a complete solution. Choose two).

A) context.Parts.SelectMany(p => context.Parts.Select(q => p.Name == q.Name && p.Id != q.Id));
B) context.Parts.GroupBy(p => p.Name).Where(g => g.Count() > 1).SelectMany(x => x);
C) context.Parts.Any(p => context.Parts.Any(q => p.Name == q.Name));
D) context.Parts.Where(p => context.Parts.Any(q => q.Name == p.Name && p.Id != q.Id);

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 load records from the Customers table
into a DataSet object named dataset.
You need to retrieve the value of the City field from the first and last records in the Customers table.
Which code segment should you use?

A) DataTable dt = dataset.Tables["Customers"]; string first = dt.Rows[0]["City"].ToString(); string last = dt.Rows[dt.Rows.Count]["City"].ToString();
B) DataTable dt = dataset.Tables["Customers"]; string first = dt.Rows[0]["City"].ToString(); string last = dt.Rows[dt.Rows.Count - 1]["City"].ToString();
C) DataRelation relationFirst = dataset.Relations[0]; DataRelation relationLast = dataset.Relations[dataset.Relations.Count]; string first = relationFirst.childTable.Columns["City"].ToString(); string last = relationLast.childTable.Columns["City"].ToString();
D) DataRelation relationFirst = dataset.Relations[0]; DataRelation relationLast = dataset.Relations[dataset.Relations.Count - 1]; string first = relationFirst.childTable.Columns["City"].ToString(); string last = relationLast.childTable.Columns["City"].ToString();

Solutions: