You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
You create the following Entity Data Model.

You add the following code fragment:
using(var context = new AdventureWorksLTEntities())
{ Customer cust = context.Customers.First(); cust.CompanyName = "Contoso"; int count = 0;
}
The changes to the cust entity must be saved. If an exception is thrown, the application will attempt to save
up to 3 times.
If not, an exception is thrown. Which code segment should you use?

• A. while(context.ObjextStateManager.GetObjectStateEntry (cust).OriginalValues.IsDBNull(0)) {
  if(count++ >2)
  {
  break;
  }
  context.SaveChanges();
  }
• B. while(true)
  { context.SavingChanges += delegate(System.Object o, System.EventArgs e) {
  if(count++ >2)
  {
  throw new Exception();
  }
  context.SaveChanges();
  }
  }
• C. while(count++ < 3)
  {
  try
  {
  context.SaveChanges();
  break;
  }
  catch(Exception)
  {
  }
  }
• D. while(cust.EntityState == EntityState.Modified)
  {
  try
  {
  context.SaveChanges();
  }
  catch(Exception)
  {
  if(count++ > 2 && context.Connection.State ==
  ConnectionState.Broken
  {
  throw new Exception();
  }
  }
  }

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database.
You need to use a spatial value type as a parameter for your database query. What should you do?

• A. Set the parameter's SqlDbType to Structured. Set the parameter's TypeName to GEOMETRY.
• B. Set the parameter's SqlDbType to Binary.
• C. Set the parameter's SqlDbType to Variant.
• D. Set the parameter's SqlDbType to Udt. Set the parameter's UdtTypeName to GEOMETRY.

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities.
You need to associate a previously deserialized entity named person1 to an object context named model
and persist changes to the database.
Which code segment should you use?

• A. model.People.Attach(person1); model.SaveChanges();
• B. model.People.ApplyChanges(person1) ; model.SaveChanges();
• C. person1.AcceptChanges(); model.SaveChanges();
• D. model.AttachTo("People", person1); model.SaveChanges();

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use the ADO.NET Entity Data Model (EDM) to define a Customer entity.
You need to add a new Customer to the data store without setting all the customer's properties. What
should you do?

• A. Override the Create method for the Customer object.
• B. Override the SaveChanges method for the Customer object.
• C. Call the Create method of the Customer object.
• D. Call the CreateObject method of the Customer object.

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