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

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

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 create the classes shown in the following exhibit:

You add the following code segment to the application. (Line numbers are included for reference only.)
01 public void QueryPlayers (List <League> leagues) {
02 ...
03 }
You create a LINQ query to retrieve a collection of Player objects.
You need to ensure that the collection includes all the players from each team and every league. Which
code segment should you insert at line 02?

A) var query = leagues.SelectMany(l => l.Teams.Select(t => t.Players));
B) var query = leagues.SelectMany(l => l.Teams.SelectMany(t => t.Players));
C) var query = leagues.Select(l => l.Teams.SelectMany(t => t.Players));
D) var query = leagues.Select(l => l.Teams.Select(t => t.Players));

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server 2008 database. The application includes a SqlConnection named
conn and a SqlCommand named cmd.
You need to create a transaction so that database changes will be reverted in the event that an exception is
thrown.
Which code segment should you use?

A) var transaction = conn.BeginTransaction(); cmd.Transaction = transaction; try {
...
}
catch
{
transaction.Commit();
}
B) var transaction = conn.BeginTransaction(); cmd.Transaction = transaction; try {
...
transaction.Commit();
}
catch
{
transaction.Rollback();
}
C) var transaction = conn.BeginTransaction(); cmd.Transaction = transaction; try {
...
transaction.Rollback();
}
catch
{
transaction.Dispose();
}
D) var transaction = conn.BeginTransaction(); cmd.Transaction = transaction; try {
...
transaction.Commit();
}
catch
{
transaction.Dispose();
}

4. You are developing a new feature that displays an auto-complete list to users as the type color names. You
have an
existing ContosoEntities context object named contex.
To support the new feature you must develop code that will accept a string object named text containing a
user's
partial input and will query the Colors database table to retrieve all color names that begin with that input.
You need to create an Entity SQL (ESQL) query to meet the requirement.
The query must not be vulnerable to a SQL injection attack. Which code segment should you use?

A) var parameter = new ObjectParameter("text", text + "%");
var result = context.CreateQuery<string>(
"SELECT VALUE (c.Name) FROM Colors AS c WHERE c.Name LIKE @text",
parameter);
B) var parameter = new ObjectParameter("text", text + "%");
var result = context.CreateQuery<string>( "SELECT (c.Name) FROM Colors AS c WHERE c.Name LIKE @text", parameter);
C) var parameter = new ObjectParameter("text", HttpUtility.HtmlEncode(text) + "%"); var result = context.CreateQuery<string>(
"SELECT (c.Name) FROM Colors AS c WHERE c.Name LIKE '@text'@, parameter);
D) var parameter = new ObjectParameter("text", text + "%"); var result = context.CreateQuery<string>(
"SELECT VALUE (c.Name) FROM Colors AS c WHERE c.Name LIKE '@text'", parameter);

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.
The Data Definition Language (DDL) script of the database contains the following code segment:
CREATE TABLE [Sales].[SalesOrderHeader]( [SalesOrderID] [int] IDENTITY(1,1) NOT NULL, [BillToAddressID] [int] NOT NULL, ... CONSTRAINT [PK_SalesOrderHeader_SalesOrderID] PRIMARY KEY CLUSTERED ([SalesOrderID] ASC) )
ALTER TABLE [Sales].[SalesOrderHeader] WITH CHECK ADD CONSTRAINT [FK_SalesOrderHeader_Address] FOREIGN KEY([BilIToAddressID]) REFERENCES [Person].[Address]([AddressID])
You create an ADO.NET Entity Framework model. You need to ensure that the entities of the model
correctly map to the DDL of the database.
What should your model contain?

A) Option
B) Option
C) Option
D) Option

Solutions: