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

1. Refer to the following lines in the case study: PA40 in \Model\Part.cs, PR16 in\Model\Product.cs, and CT14 in \Model\Component.cs
The application must create XML files that detail the part structure for any product. The XML files must use the following format:
<?xml version="1.0" encoding="utf-8"?>
<product name="Brush" description="Brush product" productType="1">
<component name="Handle" description="Handle" partType="2">
<component name="Screw" description="Screw" partType="3">
<component name="Wood" description="Wooden shaft" partType="45">
</component>
<component name="Head" description="Head" partType="5">
<component name="Screw" description="Screw" partType="3">
<component name="Bristles" description="Bristles" partType="4">
</component> </product>
You need to update the application to support the creation of an XElement object having a structure that will
serialize to the format shown above.
What should you do? (Each correct answer presents part of the solution. Choose two.)

A) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XElement("name", this.Name),
new XElement("description", this.Description),
new XElement("productType", this.ProductType));
B) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XAttribute("name", this.Name),
new XElement("description", this.Description),
new XElement("partType", this.PartType));
C) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XAttribute("name", this.Name),
new XAttribute("description", this.Description),
new XAttribute("partType", this.PartType));
D) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XElement("name", this.Name),
new XElement("description", this.Description),
new XElement("partType", this.PartType));
E) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XAttribute("name", this.Name),
new XAttribute("description", this.Description),
new XAttribute("productType", this.ProductType));
F) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XAttribute("name", this.Name),
new XElement("description", this.Description),
new XElement("productType", this.ProductType));

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 2008 database. The application uses DataContexts to
query the database.
You create a function that meets the following requirements:
-Updates the Customer table on the database when a customer is marked as deleted.
-Updates the related entries in other tables (CustomerAddress, CustomerContacts) by marking them as deleted.
-Prevents consumer code from setting the Deleted column's value directly.
You need to ensure that the function verifies that customers have no outstanding orders before they are
marked as deleted.
You also need to ensure that existing applications can use the update function without requiring changes in
the code.
What should you do?

A) Add new entities to the DataContext object for the Customers and Orders tables.
B) Override the Delete operation of the DataContext object.
C) Override the Update operation of the DataContext object.
D) Modify the SELECT SQL statement provided to the DataContext object to use an INNER JOIN between the Customer and Orders tables.

3. 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 has two DataTable objects that reference the Customers and Orders tables in the
database.
The application contains the following code segment. (Line numbers are included for reference only.)
01 DataSet customerOrders = new DataSet();
02 customerOrders.EnforceConstraints = true;
03 ForeignKeyConstraint ordersFK = new ForeignKeyConstraint("ordersFK",
04 customerOrders.Tables
["Customers"].Columns["CustomerID"],
05 customerOrders.Tables["Orders"].Columns
["CustomerID"]);
06 ...
07 customerOrders.Tables["Orders"].Constraints.Add(ordersFK);
You need to ensure that an exception is thrown when you attempt to delete Customer records that have related Order records.
Which code segment should you insert at line 06?

A) ordersFK.DeleteRule = Rule.Cascade;
B) ordersFK.DeleteRule = Rule.SetDefault;
C) ordersFK.DeleteRule = Rule.SetNull;
D) ordersFK.DeleteRule = Rule.None;

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 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();
B) context.SaveChanges(SaveOptions.AcceptAllChangesAfterSave);
C) context.SaveChanges(SaveOptions.DetectChangesBeforeSave);
D) context.SaveChanges(SaveOptions.None);

5. 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 create a DataSet object in the
application.
You add two DataTable objects named App_Products and App_Categories to the DataSet.
You add the following code segment to populate the DataSet object.
(Line numbers are included for reference only.)
01 public void Fill(SqlConnection cnx, DataSet ds)
02 {
03 var cmd = cnx.CreateCommand();
04 cmd.CommandText = "SELECT * FROM dbo.Products; " + "SELECT * FROM
dbo.Categories";
05 var adapter = new SqlDataAdapter(cmd);
06 ...
07 }
You need to ensure that App_Products and App_Categories are populated from the dbo.Products and
dbo.Categories database tables.
Which code segment should you insert at line 06?

A) adapter.TableMappings.Add("Products", "App_Products"); adapter.TableMappings.Add("Categories", "App_Categories"); adapter.Fill(ds);
B) adapter.Fill(ds, "Products"); adapter.Fill(ds, "Categories");
C) adapter.TableMappings.Add("Table", "App_Products"); adapter.TableMappings.Add("Table1", "App_Categories"); adapter.Fill(ds);
D) adapter.Fill(ds.Tables["App_Products"]); adapter.Fill(ds.Tables["App_Categories"]);

Solutions: