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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:
1. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
You add the following stored procedure to the database.
CREATE PROCEDURE dbo.GetClassAndStudents AS BEGIN
SELECT * FROM dbo.Class
SELECT * FROM dbo.Student
END
You create a SqIConnection named conn that connects to the database.
You need to fill a DataSet from the result that is returned by the stored procedure.
The first result set must be added to a DataTable named Class, and the second result set must be added to
a DataTable named Student.
Which code segment should you use?
A) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ds.Tables.Add("Class"); ds.Tables.Add("Student"); ad.Fill(ds);
B) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.TableMappings.Add("Table", "Class"); ad.TableMappings.Add("Table1", "Student") ; ad.Fill(ds) ;
C) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.Fill(ds);
D) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.MissingMappingAction = MissingMappingAction.Ignore; ad.Fill(ds, "Class"); ad.Fill(ds, "Student");
2. 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 ADO.NET Entity Framework to manage persistence-ignorant entities. You create an
ObjectContext instance named context.
Then, you directly modify properties on several entities. You need to save the modified entity values to the
database.
Which code segment should you use?
A) context.SaveChanges(SaveOptions.AcceptAllChangesAfterSave);
B) context.SaveChanges(SaveOptions.None);
C) context.SaveChanges(SaveOptions.DetectChangesBeforeSave);
D) context.SaveChanges();
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.
The application allows users to make changes while disconnected from the data store.
Changes are submitted to the data store by using the SubmitChanges method of the DataContext object.
You receive an exception when you call the SubmitChanges method to submit entities that a user has
changed in offline mode.
You need to ensure that entities changed in offline mode can be successfully updated in the data store.
What should you do?
A) Set the DeferredLoadingEnabled property of DataContext to true.
B) Set the ObjectTrackingEnabled property of DataContext to true.
C) Call the SubmitChanges method of DataContext with a value of System.Data.Linq.ConflictMode.ContinueOnConflict.
D) Call the SaveChanges method of DataContext with a value of false.
4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You are creating the data layer of the application. You write the following code segment.
(Line numbers are included for reference only.)
01 public static SqlDataReader GetDataReader(string sql)
02 {
03 SqlDataReader dr = null;
04 ...
05 return dr;
06 }
You need to ensure that the following requirements are met: The SqlDataReader returned by the GetDataReader method can be used to retreive rows from the database.
--
SQL connections opened within the GetDataReader method will close when the SqlDataReader is closed.
Which code segment should you insert at the line 04?
A) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); { try { dr = cmd.ExecuteReader(); cnn.Close(); } catch {
throw;
}
}
B) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); { try { dr = cmd.ExecuteReader(); } finally {
cnn.Close();
}
}
C) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn);
cnn.Open();
{
try
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
cnn.Close();
throw;
}
}
D) using(SqlConnection cnn = new SqlConnection(strCnn)) { try { SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); dr = cmd.ExecuteReader(); } catch {
throw;
}
}
5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that uses the ADO.NET Entity Framework to model entities. You create an entity model as shown in the following diagram.
You need to ensure that all Person entities and their associated EmailAddresses are loaded. Which code segment should you use?
A) var people = context.People.Include("EmailAddresses").ToList();
B) var people = context.People.Except(new ObjectQuery<Person>("EmailAddresses", context)).ToList();
C) var people = context.People.Include("Person.EmailAddresses").ToList();
D) var people = context.People.Except(new ObjectQuery<Person>("Person.EmailAddresses", context)).ToList();
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: A |







