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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 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 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();
B) 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();
C) 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();
D) 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();

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

3. The Entity Data Model file (.edmx file) must be updated to support inheritance mapping for Products and Componets.
You need to add the following code to the \Model\Model.edmx file:
-the code in line EX243 that maps the Product type
-the code in line EX250 that maps the Component type
What should you do?

A) Insert the following code at line EX243:
<Condition ColumnName="ProductType" IsNull="true" />
Insert the following code at line EX250:
<Condition ColumnName="PartType" IsNull="false" />
B) Insert the following code at line EX243:
<Condition ColumnName="ProductType" IsNull="false" />
Insert the following code at line EX250:
<Condition ColumnName="PartType" IsNull="false" />
C) Insert the following code at line EX243:
<Condition ColumnName="ProductType" IsNull="true" />
Insert the following code at line EX250:
<Condition ColumnName="PartType" IsNull="true" />
D) Insert the following code at line EX243:
<Condition ColumnName="ProductType" IsNull="false" />
Insert the following code at line EX250:
<Condition ColumnName="PartType" IsNull="true" />

4. You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to develop an application that uses the Entity Data Model for the fallowing database tables.

You need to ensure that the entity that is mapped to the ContectTypeDerived table derives from the entity that is mapped to the ContentTypeBase table. What should you do?

A) Create a complect type for each entity.
B) Use a Table-Per-Hierarchy mapping method.
C) Create a function import for each entity.
D) Use a Table-Per-Type mapping method.

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.
The application uses the following object query to load a product from the database.
(Line numbers are included for reference only.)
01 using (AdventureWorksEntities advWorksContext = new AdventureWorksEntities
())
02 {
03 ObjectQuery <Product> productQuery = advWorksContext.Product.Where
("it.ProductID = 900");
04 ...
05 }
You need to log the command that the query executes against the data source. Which code segment should you insert at line 04?

A) Trace.WriteLine(productQuery.ToTraceString());
B) Trace.WriteLine(productQuery.CommandText);
C) Trace.WriteLine(productQuery.ToString());
D) Trace.WriteLine(((IQueryable)productQuery).Expression);

Solutions: