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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.
You use the following SQL statement to retrieve an instance of a DataSet object named ds:
SELECT CustomerID, CompanyName, ContactName, Address, City FROM dbo.Customers
You need to query the DataSet object to retrieve only the rows where the ContactName field is not NULL. Which code segment should you use?

A) from row in ds.Tables[0].AsEnumerable() where !row.IsNull((string)row["ContactName"]) select row;
B) from row in ds.Tables[0].AsEnumerable() where (string)row["ContactName"] != null select row;
C) from row in ds.Tables[0].AsEnumerable() where !Convert.IsDBNull(row.Field<string>("ContactName")) select row;
D) from row in ds.Tables[0].AsEnumerable() where row.Field<string>("ContactName") != null select row;

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses LINQ to SQL.
The application contains the following model. You write the following code. (Line numbers are included for
reference only.)
01 static void Insert()
02 {
03 NorthwindDataContext dc = new NorthwindDataContext();
04 Customer newCustomer = new Customer();
05 newCustomer.Firstname = "Todd";
06 newCustomer.Lastname = "Meadows";
07 newCustomer.Email = "[email protected]";
08 .....
09 dc.SubmitChanges();
10 }

A product named Bike Tire exists in the Products table. The new customer orders the Bike Tire product.
You need to ensure that the correct product is added to the order and that the order is associated with the
new customer.
Which code segment should you insert at line 08?

A) Order newOrder = new Order();
newOrder.Product = (from p in dc.Products
where p.ProductName == "Bike Tire"
select p) .First();
B) Product newProduct = new Product(); newProduct.ProductName = "Bike Tire"; Order newOrder = new Order (); newOrder.Product = newProduct; newCustomer.Orders.Add(newOrder) ;
C) Product newProduct = new Product(); newProduct.ProductName = "Bike Tire"; Order newOrder = new Order(); newOrder.Product = newProduct;
D) Order newOrder = new Order();
newOrder.Product = (from p in dc.Products
where p.ProductName == "Bike Tire"
select p).First();
newCustomer.Orders.Add(newOrder) ;

3. You use Microsoft .NET Framework 4.0 to develop an ASP.NET application. The application uses
Integrated Windows authentication.
The application accesses data in a Microsoft SQL Server 2008 database that is located on the same server
as the application.
You use the following connection string to connect to the database.
Integrated Security=SSPI; Initial Catalog=AdventureWorks;
The application must also execute a stored procedure on the same server on a database named pubs.
Users connect to the ASP.NET application through the intranet by using Windows-based authentication.
You need to ensure that the application will use connection pooling whenever possible and will keep the
number of pools to a minimum.
Which code segment should you use?

A) command.CommandText = "USE [pubs]; exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Initial Catalog=AdventureWorks; Integrated Security=SSPI; MultipleActiveResultSets=True")) {
connection.Open();
command.ExecuteNonQuery();
}
B) command.CommandText = "exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI; Initial Catalog=pubs")) {
connection.Open();
command.ExecuteNonQuery();
}
C) command.CommandText = "USE [pubs]; exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI; Initial Catalog=AdventureWorks")) {
connection.Open();
command.ExecuteNonQuery();
}
D) command.CommandText = "exec uspLoginAudit;";
using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI;")) {
connection.Open();
command.ExecuteNonQuery();
}

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You deploy a Windows Communication Foundation (WCF) Data Service to a production server.
The application is hosted by Internet Information Services (IIS).
After deployment, applications that connect to the service receive the following error message:
"The server encountered an error processing the request. See server logs for more details."
You need to ensure that the actual exception data is provided to client computers. What should you do?

A) Modify the application's Web.config file. Set the value for the customErrors element to Off.
B) Add the ServiceBehavior attribute to the class that implements the data service.
C) Modify the application's Web.config file. Set the value for the customErrors element to RemoteOnly.
D) Add the FaultContract attribute to the class that implements the data service.

5. The application user interface displays part names or color names in many plases as '## Name ##'.
You need to provide a method named FormattedName() to format part names and color names throughout
the
application. What should you do?

A) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this Part entity){
return string.Format("## {0} ##", entity.Name)
}
B) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this IName entity){
return string.Format("## {0} ##", entity.Name)
}
C) Add the following code segmend to the Color class in Color.cs:
public string FormattedName(){
return string.Format("## {0} ##", this.Name);
}
D) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this Color entity){
return string.Format("## {0} ##", entity.Name)
}
E) Add the following code segmend to the Part class in Part.cs:
public string FormattedName(){
return string.Format("## {0} ##", this.Name);
}

Solutions: