Microsoft 070-516 : TS: Accessing Data with Microsoft .NET Framework 4

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

1. You add a table to the database to track changes to part names. The table stores the following row values:
-the username of the user who made the change
-a part ID
-the new part name
-a DateTime value
You need to ensure detection of unauthorized changes to the row values.
You also need to ensure that database users can view the original row values.

A) Add a column named hash. Use System.Security.Cryptography.MD5 to create an MD5 hash of the row values, and store in the hash column.
B) Add a column named signature. Use System.Security.Cryptography.RSA to create a signature for all of the row values. Store the signature in the signature column. Publish only the public key internally.
C) Use System.Security.Cryptography.RSA to encrypt all the row values. Publish only the key internally.
D) Use System.Security.Cryptography.DES to encrypt all the row values using an encryption key held by the application.

2. Which method will return all nodes of an XDocument?

A) doc.Descendants();
B) doc.DescendantNodes();
C) doc.GetAllnodes();
D) doc.Root.Allnodes();

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use the ADO.NET Entity Framework to model your entities.
The application connects to a Microsoft SQL Server 2008 database named AdventureWorks by using
Windows Authentication.
Information about the required Entity Data Model (EDM) is stored in the following files:
-model.csdl
-model.ssdl
-model.msl
These files are embedded as resources in the MyCompanyData.dll file.You need to define the connection
string
that is used by the application. Which connection string should you add to the app.config file?

A) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Datamodel.csdl| res://MyCompany.Data.model.ssdl| res://MyCompany.Data.model.msl; provider=System.Data.SqlClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=SSPI;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>
B) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.ssdl| res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.msl; provider=System.Data.SqlClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=True;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>
C) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.ssdl| res://MyCompany.Data,Culture=neutral, PublicKeyToken=null/model.msl; provider=System.Data.EntityClient; provider connection string='DataSource=localhost;Initial Catalog=AdventureWorks;lntegrated
Security=True;multipleactivesuitsets=true'"
providerName="System.Data.SqlClient"/>
D) <add name="AdventureWorksEntities" connectionString="metadata=res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/
model.csdIl
res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/model.ssdIl
res://MyComparny.Data,Culture=neutral,PublicKeyToken=null/model.msl;
provider=System.Data.OleDBClient;
provider connection string='Provider=sqloledb;DataSource=localhost;Initial
Catalog=AdventureWorks;lntegrated Security=SSPI;multipleactivesuitsets=true'"
providerName="System.Data.EntityClient"/>

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)
01 class DataAccessLayer
02 {
03 private static string connString;
04 ...
05 ...
06 public static DataTable GetDataTable(string command){
07 ...
08 ...
09 }
10 }
You need to define the connection life cycle of the DataAccessLayer class.
You also need to ensure that the application uses the minimum number of connections to the database.
What should you do?

A) Replace line 01 with the following code segment.
class DataAccessLayer : IDisposable
Insert the following code segment to line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Dispose()
{
conn.Close();
}
B) Insert the following code segment at line 04.
private static SqlConnection conn = new SqlConnection(connString);
public static void Open()
{
conn.Open();
}
public static void Close()
{
conn.Close();
}
C) Insert the following code segment at line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Close()
{
conn.Close();
}
D) Insert the following code segment at line 07:
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
}

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

Solutions: