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

1. You need to ensure that an exception is thrown when color names are set to less than two characters. What should you do?

A) Add the following method to the Color partial class in Model\Color.cs:
protected overrride void OnPropertyChanging(string property)
{
if (property == "Name" && this.Name.Length < 2)
throw new ArgumentOutOfRangeException("Name must be at least two
characters");
}
B) Add the following code segment to the ContosoEntities partial class in Model\ContosoEntities.cs:
public override in SaveChanges(System.Data.Objects.SaveOptions options)
{
var changes = this.ObjectStateManager.GetObjectSateEntries
(System.Data.EntityState.Added);
foreach (var change in changes)
{
if (change.Entity is Color) if (((Color)change.Entity.Name.Length < 2) throw new ArgumentException ("Name too short");
}
return base.SaveChanges(options);
}
C) Add the following method to the Color partial class in Model\Color.cs:
protected overrride void OnPropertyChanged(string property)
{
if (property == "Name" && this.Name.Length < 2)
throw new ArgumentOutOfRangeException("Name must be at least two
characters");
}
D) Add the following attribute to the Name property of the Color class in the entity designer file:
[StringLength(256, MinimumLength = 2)]

2. You use Microsoft .NET Framework 4.0 to develop an application that uses the Entity Framework.
The application defines the following Entity SQL (ESQL) query, which must be executed against the mode.
string prodQuery = "select value p from Products as p where
p.ProductCategory.Name = @p0";
You need to execute the query. Which code segment should you use?

A) var prods = ctx.CreateQuery<Product>(prodQuery, new ObjectParameter("p0", "Road Bikes")).ToList();
B) var prods = ctx.ExecuteFunction<Product>(prodQuery, new ObjectParameter("p0", "Road Bikes")).ToList();
C) var prods = ctx.ExecuteStoreQuery<Product>(prodQuery, new ObjectParameter("p0", "Road Bikes")).ToList();
D) var prods = ctx.ExecuteStoreCommand(prodQuery, new ObjectParameter("p0", "Road Bikes")).ToList();

3. You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to develop an application.
You use entity Framework Designer to create an Entity Data Model from an existing database by using the
Generate From Database wizard.
The model contains an entity type named Product. The Product type requires an additional property that is
not mapped to database colomn.
You need to add the property to product. What should you do?

A) Add the property in a partial class named Product in a new source file.
B) Add the property in the generated class file, and select Run Custom Tool from the solution menu.
C) Create a function import with the name of property in the Entity Framework Designer.
D) Create a comlex type with the name of the property in the Entity Framework Designer.

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

You write a method named ValidatePostalCode to validate the postal code for the application.
You need to ensure that the ValidatePostalCode method is called before the PostalCode property set
method is completed and before the underlying value has changed.
Which code segment should you place in the entity's partial class?

A) partial void OnPostalCodeChanged(string value) {
PostalCode = GetValidValue<string>(value, "ValidatePostalCode", false, true) ;
}
B) public string ValidatedPostalCode
{
set
{
_PostalCode = StructuralObject.SetValidValue("ValidatePostalCode", false);
}
get
{
return _PostalCode;
}
}
C) public string ValidatedPostalCode
{
set
{
ValidatePostalCode(value);
_PostalCode = value;
}
get
{
return _PostalCode;
}
}
D) partial void OnPostalCodeChanging(string value) {
ValidatePostalCode(value);
}

5. 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 need to create a database from your model. What should you do?

A) Use the Update Model Wizard in Visual Studio.
B) Run the edmgen.exe tool in FullGeneration mode.
C) Use the Generate Database Wizard in Visual Studio. Run the resulting script against a Microsoft SQL Server database.
D) Run the edmgen.exe tool in FromSSDLGeneration mode.

Solutions: