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

1. You use Microsoft .NET Framework 4.0 to develop an ASP.NET Web application that connects to a
Microsoft SQL Server 2008 database.
The application uses Integrated Windows authentication in Internet Information Services (IIS) to
authenticate users.
A connection string named connString defines a connection to the database by using integrated security.
You need to ensure that a SqlCommand executes under the application pool's identity on the database
server.
Which code segment should you use?

A) using (var conn = new SqlConnection(connString))
{
var cmd = new SqlCommand ("SELECT * FROM BLOG, conn);
conn.Open();
using(HostingEnvironment.Impersonate())
{
var result = cmd.ExecuteScalar();
}
}
B) using (var conn = new SqlConneccion())
{
using (HostingEnvironroent.Impersonate())
{
conn.ConnectionString = connString;
}
var cmd = new SqlCommand("SELECT * FROM BLOG, conn);
conn.Open() ;
var result = cmd.ExecuteScalar();
}
C) using (var conn = new SqlConnection())
{
conn.ConnectionString = connString;
var cmd = new SqlCommand("SELECT * FROM BLOG", conn);
using (HostingEnvironment.Impersonate())
{
conn.Open();
}
var result = cmd.ExecuteScalar();
}
D) using (var conn = new SqlConnection())
{
conn.ConnectionString = connString;
SqlCommand cmd = null;
using (HostingEnvironment.Impersonate())
{
cmd = new SqlCommand("SELECT * FROM BLOG", conn);
}
conn.Open();
var result = cmd.ExecuteScalar();
}

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 database includes a database table named ProductCatalog as shown in the exhibit:

You add the following code segment to query the first row of the ProductCatalog table. (Line numbers are included for reference only.)
01 using(SqlConnection cnx = new SqlConnection(connString)
02 {
03 var command = cnx.CreateCommand();
04 command.CommandType = CommandType.Text;
05 command.CommandText = "SELECT TOP 1 * FROM dbo.ProductCatalog";
06 cnx.Open();
07 var reader = command.ExecuteReader();
08 if (reader.Read())
09 {
10 var id = reader.GetInt32(0);
11 ...
12 reader.Close();
13 }
14 }
Which answer belongs in line 11?

A) var weight = reader.GetFloat(1); var price = reader.Doublel(2); var status = reader.GetByte(3);
B) var weight = reader.GetDouble(1); var price = reader.GetFloat(2); var status = reader.GetBoolean(3);
C) var weight
= reader.GetFloat(1); var price = reader.GetDecimal(2); var status = reader.GetByte(3);
D) var weight = reader.GetDouble(1); var price = reader.GetDecimal(2); var status = reader.GetBoolean(3);

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.
You write the following code segment that executes two commands against the database within a
transaction.
(Line numbers are included for reference only.)
01 using(SqlConnection connection = new SqlConnection(cnnStr)) {
02 connnection.Open();
03 SqlTransaction sqlTran = connection.BeginTransaction();
04 SqlCommand command = connection.CreateCommand();
05 command.Transaction = sqlTran;
06 try{
07 command.CommandText = "INSERT INTO Production.ScrapReason(Name)
VALUES('Wrong size')";
08 command.ExecuteNonQuery();
09 command.CommandText = "INSERT INTO Production.ScrapReason(Name)
VALUES('Wrong color')";
10 command.ExecuteNonQuery();
11 ...
l2 }
You need to log error information if the transaction fails to commit or roll back. Which code segment should you insert at line 11?

A) catch (Exception ex) { sqlTran.Rollback();
Trace.WriteLine(ex.Message);
}
finaly {
try {
sqltran.commit( );
}
catch (Exception exRollback) {
Trace.WriteLine(excommit.Message);
}
}
B) sqlTran.Commit(); } catch (Exception ex) {
sqlTran.Rollback();
Trace.WriteLine(ex.Message);
}
C) catch (Exception ex){ Trace.WriteLine(ex.Message); try{
sqlTran.Rollback();
}
catch (Exception exRollback){
Trace.WriteLine(exRollback.Message);
}
}
finaly {
sqltran.commit( );
}
D) sqlTran.Commit(); } catch (Exception ex) {
Trace.WriteLine(ex.Message);
try {
sqlTran.Rollback();
}
catch (Exception exRollback) {
Trace.WriteLine(exRollback.Message);
}
}

4. You use Microsoft Visual Studio 2010 and Microsoft ADO.NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database.
You use the ADO.NET LINQ to SQL model to retrieve data from the database. You use stored procedures
to return multiple result sets.
You need to ensure that the result sets are returned as strongly typed values. What should you do?

A) Apply the FunctionAttribute and ParameterAttribute to the stored procedure function and directly access the strongly typed object from the results collection.
B) Apply the FunctionAttribute and ResultTypeAttribute to the stored procedure function. Use the GetResult<TElement> method to obtain an enumerator of the correct type.
C) Apply the ParameterAttribute to the stored procedure function. Use the GetResult<TElement> method to obtain an enumerator of the correct type.
D) Apply the ResultTypeAttribute to the stored procedure function and directly access the strongly typed object from the results collection.

5. Which code segment will properly return the TimeSpan returned by the stopWatch variable?

A) Stopwatch stopWatch = new Stopwatch(); stopWatch.Start(); DoSomething(); stopWatch.Reset(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
B) Stopwatch stopWatch = new Stopwatch(); stopWatch.Begin(); DoSomething(); stopWatch.End(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
C) Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
DoSomething();
stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds,
ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }
D) Stopwatch stopWatch = new Stopwatch(); stopWatch.Start(); DoSomething(); TimeSpan ts = stopWatch.Elapsed; string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10); Console.WriteLine(elapsedTime, "RunTime");
private void DoSomething()
{ ... }

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