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

1. You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to enhance and existing application use
Entity Framework.
The classes that represent the entites in the model are Plain old CLR Object (POCO) Classes.
You need to connect the existing POCO classes to an entity framework context. What should you do?

A) 1. Generate a MetadataWorkspace and create an ObjectContext for the model.
2.Create an ObjectSet fort he POCO classes.
3.Disable Proxy object creation on the ContextOptions of the ObjectContext.
B) 1. Generate an Entity Data Model for the POCO classes.
2.Create an ObjectSet for the POCO classes.
3.Set Code Generation Strategy on the Entity Data Model to none.
4.Create an ObjectContext for the model.
C) 1. Generate a MetadataWorkspace and create an ObjectContext for the model.
2.Disable Proxy object creation on the ContextOptions of the ObjectContext.
3.Enable lazy loading on the ContextOptions of the ObjectContext.
D) 1. Generate an Entity Data Model fort he POCO classes.
2.Create an ObjectSet fort he POCO classes.
3.Disable Proxy object creation on the ContextOptions of the ObjectContext.
4.Enable lazy loading on the ContextOptions of the ObjectContext.

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a multi-tier application.
You use Microsoft ADO.NET Entity Data Model (EDM) to model entities.
The model contains entities named SalesOrderHeader and SalesOrderDetail.
For performance considerations in querying SalesOrderHeader, you detach SalesOrderDetail entities from
ObjectContext.
You need to ensure that changes made to existing SalesOrderDetail entities updated in other areas of your
application are persisted to the database.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Call ObjectContext.ApplyOriginalValue.
B) Set the MergeOption of SalesOrderDetail to MergeOptions.OverwriteChanges.
C) Set the MergeOption of SalesOrderDetail to MergeOptions.NoTracking.
D) Re-attach the SalesOrderDetail entities.
E) Call ObjectContext.ApplyCurrentValue.

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. The application contains the following XML document:
<bib> <book title="TCP/IP Illusrated" year="1994">
<author>Author1</author>
</book>
<book title="Programming in UNIX" year="1992">
<author>Author1</author>
<author>Author2</author>
<author>Author3</author>
</book>
<book title="Data on the web" year="2000">
<author>Author4</author>
<author>Author3</author>
</book> </bib>
You add the following code fragment. (Line numbers are included for reference only.)
01 public IEnumerable<XElement> GetBooks(string xml)
02 {
03 XDocument doc = XDocument.Parse(xml);
04 ...
05 }
You need to return a list of book XML element that are authored by Author1. Which code segment should you insert at line 04?

A) return doc.Elements("bib").Elements() .Where(e1 => e1.Elements().Any(e2 => (string)e2 == "Author1"));
B) return doc.Elements("bib").Elements()
.Where(e1 => e1.Elements().Any(e2 => e2.Equals(new XElement("author", "Author1"))));
C) return doc.Element("bib").Elements() .SelectMany(el => el.Elements() .Where(e2 => (string)e2 == "Author1"));
D) return doc.Element("bib").Elements() .SelectMany(el => el.Elements() .Where(e2 => e2.Equals(new XElement("author", "Author1"))));

4. You are developing a new feature in the application to display a list of all bundled products.
You need to write a LINQ query that will return a list of all bundled products. Which query expression should
you use?

A) context.Parts.OfType<Product>() .Where(p => p.Descendants.Any(d => d is Product))
B) context.Parts.Cast<Product>() .Where(p => p.Descendants.Any(d => d is Product))
C) context.Parts.Cast<Product>() .ToList() .Where(p => p.Descendants.Any(d => d is Product))
D) context.Parts.OfType<Product>() .ToList() .Where(p => p.Descendants.Any(d => d is Product))

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) 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();
B) DataTable dt = dataset.Tables["Customers"]; string first = dt.Rows[0]["City"].ToString(); string last = dt.Rows[dt.Rows.Count - 1]["City"].ToString();
C) DataTable dt = dataset.Tables["Customers"]; string first = dt.Rows[0]["City"].ToString(); string last = dt.Rows[dt.Rows.Count]["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: