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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 create an application.
The application uses the ADO.NET Entity Framework to manage customer and related order records.
You add a new order for an existing customer. You need to associate the Order entity with the Customer
entity.
What should you do?

A) Use the Attach method of the ObjectContext to add both Order and Customer entities.
B) Set the Value property of the EntityReference of the Order entity.
C) Call the Add method on the EntityCollection of the Order entity.
D) Use the AddObject method of the ObjectContext to add both Order and Customer entities.

2. You use Microsoft .NET Framework 4.0 to develop an ASP.NET 4 Web application.
You need to encrypt the connection string information that is stored in the web.config file. The application is
deployed to multiple servers.
The encryption keys that are used to encrypt the connection string information must be exportable and
importable on all the servers.
You need to encrypt the connection string section of the web.config file so that the file can be used on all of
the servers.
Which code segment should you use?

A) Configuration config = WebConfigurationHanager.OpenWebConfiguration ("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection ("connectionStrings") ; section.Sectionlnformation.ProtectSection("DpapiProtectedConfigurationProvider"); config.Save ();
B) Configuration config = WebConfigurationManager.OpenMachineConfiguration ("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection ("connectionStrings") ; section.Sectionlnformation.ProtectSection("DpapiProtectedConfigurationProvider"); config.Save () ;
C) Configuration config = WebConfigurationManager.OpenMachineConfiguration("~"); ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection("connectionStrings"); section.Sectionlnformation.ProtectSection("RsaProtectedConfigurationProvider'*); config.Save();
D) Configuration config = WebConfigurationManager.OpenWebConfiguration("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection("connectionStrings"); section.Sectionlnformation.ProtectSection("RsaProtectedConfigurationProvider"); config.Save();

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application uses the ADO.NET Entity Framework to model entities.
You define a Category class by writing the following code segment. (Line numbers are included for
reference only.)
01 public class Category
02 {
03 public int CategoryID { get; set; }
04 public string CategoryName { get; set; }
05 public string Description { get; set; }
06 public byte[] Picture { get; set; }
07 ...
08 }
You need to add a collection named Products to the Category class. You also need to ensure that the
collection supports deferred loading.
Which code segment should you insert at line 07?

A) protected List <Product> Products { get; set; }
B) public abstract List <Product> Products { get; set; }
C) public static List <Product> Products { get; set; }
D) public virtual List <Product> Products { get; set; }

4. 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 use the following SQL statement to retrieve an instance of a DataSet object named ds:
SELECT CustomerID, CompanyName, ContactName, Address, City FROM dbo.Customers
You need to query the DataSet object to retrieve only the rows where the ContactName field is not NULL. Which code segment should you use?

A) from row in ds.Tables[0].AsEnumerable() where (string)row["ContactName"] != null select row;
B) from row in ds.Tables[0].AsEnumerable() where !row.IsNull((string)row["ContactName"]) select row;
C) from row in ds.Tables[0].AsEnumerable() where !Convert.IsDBNull(row.Field<string>("ContactName")) select row;
D) from row in ds.Tables[0].AsEnumerable() where row.Field<string>("ContactName") != null select row;

5. 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. You add the following table to the database.
CREATE TABLE ObjectCache ( Id INT IDENTITY PRIMARY KEY, SerializedObjectData XML)
You write the following code segment to retreive records from the ObjectCache table. (Line numbers are included for reference only.)
01 string s = GetConnectionStringFromConfigFile("xmldb");
02 using (SqlConnection conn = new SqlConnection(s))
03 using (SqlCommand cmd = new SqlCommand("select * from ObjectCache",
conn))
04 {
05 conn.Open();
06 SqlDataReader rdr = cmd.ExecuteReader();
07 while(rdr.Read())
08 {
09 ...
10 DeserializeObject(obj);
11 }
12 }
You need to retreive the data from the SerializedObjectData column and pass it to a method named
DeserializeObject.
Which line of code should you insert at line 09?

A) SByte obj = (SByte)rdr[1];
B) XmlReader obj = (XmlReader)rdr[1];
C) Type obj = (Type)rdr[1];
D) String obj = (String)rdr[1];

Solutions: