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

1. The user interface requires that a paged view be displayed of all the products sorted in alphabetical order.
The user interface supplies a current starting index and a page size in variables named startIndex and
pageSize of type int.
You need to construct a LINQ expression that will return the appropriate Parts from the database from an
existing
ContosoEntities context object named context. You begin by writing the following expression:
context.Parts
Which query parts should you use in sequence to complete the expression?
(To answer, move the appropriate actions from the list of actions to the answer area and arrange them in
the correct order.)

A) .Skip(startIndex)
B) .OrderBy(x => x.Name)
C) .Take(startIndex)
D) .Skip(pageSize)
E) .Take(pageSize);

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

3. 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 IName entity){
return string.Format("## {0} ##", entity.Name)
}
B) Add the following code segmend to the Part class in Part.cs:
public string FormattedName(){
return string.Format("## {0} ##", this.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 Part entity){
return string.Format("## {0} ##", entity.Name)
}
E) 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)
}

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. The application uses DataContexts to query
the database.
The application meets the following requirements:
-Stores customer data offline.
-Allows users to update customer records while they are disconnected from the server.
-Enables offline changes to be submitted back to the SQL Server by using the DataContext object.
You need to ensure that the application can detect all conflicts that occur between the offline customer information submitted to the SQL Server and the server version. You also need to ensure that you can roll back local changes. What should you do?

A) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch ChangeConflictExceptions.
B) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch SqlExceptions.
C) Override the Update operation of the DataContext object. Call the ExecuteDynamicUpdate method to generate the update SQL.
D) Call the SubmitChanges method of the DataContext object. Pass System.Data.Linq.ConflictMode.ContinueOnConflict to the method.

5. You use Microsoft .NET Framework 4.0 to develop an application.
You write the following code to update data in a Microsoft SQL Server 2008 database.
(Line numbers are included for reference only.)
01 private void ExecuteUpdate(SqlCommand cmd, string connString, string
updateStmt)
02 {
03 ...
04 }
You need to ensure that the update statement executes and that the application avoids connection leaks. Which code segment should you insert at line 03?

A) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery(); cmd.Connection.Close() ;
B) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery();
C) using (SqlConnection conn = new SqlConnection(connString))
{
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery();
cmd.Connection.Close();
}
D) using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open() ;
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery() ;
}

Solutions: