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Microsoft 70-516 Exam Syllabus Topics:

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

1. The application populates a DataSet object by using a SqlDataAdapter object.
You use the DataSet object to update the Categories database table in the database. You write the
following code segment.
(Line numbers are included for reference only.)
01 SqlDataAdapter dataAdpater = new SqlDataAdapter("SELECT CategoryID,
CategoryName FROM Categories", connection);
02 SqlCommandBuilder builder = new SqlCommandBuilder(dataAdpater);
03 DataSet ds = new DataSet();
04 dataAdpater.Fill(ds);
05 foreach (DataRow categoryRow in ds.Tables[0].Rows)
06 {
07 if (string.Compare(categoryRow["CategoryName"].ToString(), searchValue,
true) == 0)
08 {
09 ...
10 }
11 }
12 dataAdpater.Update(ds);
You need to remove all the records from the Categories database table that match the value of the
searchValue variable.
Which line of code should you insert at line 09?

A) ds.Tables[0].Rows.RemoveAt(0);
B) ds.Tables[0].Rows[categoryRow.GetHashCode()].Delete();
C) categoryRow.Delete();
D) ds.Tables[0].Rows.Remove(categoryRow);

2. You use Microsoft .NET Framework 4.0 and the Entity Framework to develop an application.
You create an Entity Data Model that has an entity named Customer. You set the optimistic concurrency
option for Customer.
You load and modify an instance of Customer named loadedCustomer, which is attached to an
ObjectContext named context.
You need to ensure that if a concurrency conflict occurs during a save, the application will load up-to-date
values from
the database while preserving local changes. Which code segment should you use?

A) try {
context.SaveChanges();
}
catch(EntitySqlException ex)
{
context.Refresh(RefreshMode.ClientWins, loadedCustomer);
}
B) try {
context.SaveChanges();
}
catch(OptimisticConcurrencyException ex)
{
context.Refresh(RefreshMode.ClientWins, loadedCustomer);
}
C) try {
context.SaveChanges();
}
catch(EntitySqlException ex)
{
context.Refresh(RefreshMode.StoreWins, loadedCustomer);
}
D) try {
context.SaveChanges();
}
catch(OptimisticConcurrencyException ex)
{
context.Refresh(RefreshMode.StoreWins, loadedCustomer);
}

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 manage Plain Old CLR Objects (POCO) entities.
You create a new POCO class. You need to ensure that the class meets the following requirements:
-It can be used by an ObjectContext.
-It is enabled for change-tracking proxies.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Configure the navigation property to return a type that implements the IQueryable interface.
B) Configure the navigation property to return a type that implements the ICollection interface.
C) Modify each mapped property to contain non-sealed, public, and virtual accessors.
D) Modify each mapped property to contain sealed and protected accessors.
E) Configure the navigation property to return a type that implements the IEntityWithRelationships interface.

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. The application stores user names and
passwords in the database.
You need to ensure that users cannot read passwords extracted from the database. What should you do?

A) Encrypt stored passwords by using the TripleDESCryptoServiceProvider class.
B) Append a random salt to the password by using the RNGCryptoServiceProvider class. Encrypt stored passwords by using the RijndaelManaged class.
C) Append a random salt to the password by using the RNGCryptoServiceProvider class. Hash stored passwords by using the SHA1CryptoServiceProvider class.
D) Encrypt stored passwords by using the RC2CryptoServiceProvider class.

5. A performance issue exists in the application. The following code segment is causing a performance bottleneck:
var colors = context.Parts.GetColors();
You need to improve application performance by reducing the number of database calls. Which code segment should you use?

A) var colors = context.Parts.OfType<Product>().Include ("Parts.Color").GetColors();
B) var colors = context.Parts.OfType<Product>().Include("Color").GetColors();
C) var colors = context.Parts.OfType<Product>().Include("Colors").GetColors();
D) var colors = context.Parts.OfType<Product>().Include ("Product.Color").GetColors();

Solutions: