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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 to develop an application that uses
the Entity Framework.
The application has the entity model shown in the following diagram.

The application must create a projection of the unique set of names and year-to-date sales for territories
where at least one sales person had sales last year of more than $100,000.
The projection must consist of properties named Sales and Name. You need to write a query that will
generate the required projection.
Which code segment should you use?

A) model.SalesTerritories.Where( t => t.SalesPersons.Any( p => p.SalesLastYear > 100000)) .Select( t=> new { t.Name, t.SalesYTD})
.Distinct();
B) (from person in model.SalesPersons where (person.SalesLastYear > 100000) select new {
Name = person.SalesTerritory.Name,
Sales = person.SalesTerritory.SalesYTD
}
);
C) model.SalesTerritories.Where( t=> t.SalesPersons.Any( p => p.SalesLastYear > 100000)) .Select( t=> new { t.Name, Sales = t.SalesYTD});
D) (from person in model.SalesPersons where (person.SalesLastYear > 100000) select new {
Name = person.SalesTerritory.Name,
Sales = person.SalesTerritory.SalesYTD
}
).Distinct();

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

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that connects to a MS SQL server 2008 database by User Authentication. The application contains the following connection string:
SERVER=DBSERVER-01; DATABASE=pubs; uid=sa; pwd=secret;
You need to ensure that the password value in the connection string property of a SqlConnection object
does not exist after is called.
What should you add to the connection string?

A) Persist Security Info = True
B) Persist Security Info = False
C) Trusted_Connection = False
D) Trusted_Connection = True

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
connects
to a Microsoft SQL Server 2008 database. The application performs a database query within a transaction.
You need to ensure that the application can read data that has not yet beed commited by other
transactions.
Which IsolationLevel should you use?

A) RepeatableRead
B) ReadUncommitted
C) Unspecified
D) ReadCommitted

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

Solutions: