Superexam

6. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
You write the following code segment.
string query = "Select EmpNo, EmpName from dbo.Table_1;
select Name,Age from dbo.Table_2";
SqlCommand command = new SqlCommand(query, connection);
SqlDataReader reader = command.ExecuteReader();
You need to ensure that the application reads all the rows returned by the code segment.
Which code segment should you use?
A. while (reader.NextResult())
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{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
reader.Read();
}
B. while (reader.Read())
{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
reader.NextResult();
}
C. while (reader.Read())
{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
}
reader.NextResult();
while (reader.Read())
{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
}
D. while (reader.NextResult())
{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
}
reader.Read();
while (reader.NextResult())
{
Console.WriteLine(String.Format("{0}, {1}",reader[0], reader[1]));
}
Answer: C
7. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET.
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The application has a DataTable object named OrderDetailTable. The object has the following columns:
·ID
·OrderID
·ProductID
·Quantity
·LineTotal
The OrderDetailTable object is populated with data provided by a business partner. Some of the records
contain a null value in the LineTotal field and 0 in the Quantity field.
You write the following code segment. (Line numbers are included for reference only.)
01 DataColumn col = new DataColumn("UnitPrice", typeof(decimal));
02
03 OrderDetailTable.Columns.Add(col);
You need to add a DataColumn named UnitPrice to the OrderDetailTable object.
Which line of code should you insert at line 02?
A. col.Expression = "LineTotal/Quantity";
B. col.Expression = "LineTotal/ISNULL(Quantity, 1)";
C. col.Expression = "LineTotal.Value/ISNULL(Quantity.Value,1)";
D. col.Expression = "iif(Quantity > 0, LineTotal/Quantity, 0)";
Answer: D

3. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
You need to separate the security-related exceptions from the other exceptions for database operations at
run time.
Which code segment should you use?
A. catch (System.Security.SecurityException ex)
{
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//Handle all database security related exceptions.
}
B. catch (System.Data.SqlClient.SqlException ex)
{
for (int i = 0; i < ex.Errors.Count; i++){
if (ex.Errors[i].Class.ToString() == "14") {
//Handle all database security related exceptions.
}
else{
//Handle other exceptions
}
}
}
C. catch (System.Data.SqlClient.SqlException ex)
{
for (int i = 0; i < ex.Errors.Count; i++){
if (ex.Errors[i].Number == 14){
//Handle all database security related exceptions.
}
else{
//Handle other exceptions
}
}
}
D. catch (System.Data.SqlClient.SqlException ex)
{
for (int i = 0; i < ex.Errors.Count; i++){
if (ex.Errors[i].Message.Contains("Security")){
//Handle all database security related exceptions.
}
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else{
//Handle other exceptions
}
}
}
Answer: B
4. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
You write the following code segment.
string queryString = "Select Name, Age from dbo.Table_1";
SqlCommand command = new SqlCommand(queryString,
(SqlConnection)connection));
You need to get the value that is contained in the first column of the first row of the result set returned by the
query.
Which code segment should you use?
A. var value = command.ExecuteScalar();
string requiredValue = value.ToString();
B. var value = command.ExecuteNonQuery();
string requiredValue = value.ToString();
C. var value = command.ExecuteReader(CommandBehavior.SingleRow);
string requiredValue = value[0].ToString();
D. var value = command.ExecuteReader(CommandBehavior.SingleRow);
string requiredValue = value[1].ToString();
Answer: A
5. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
You write the following code segment. (Line numbers are included for reference only.)
01 using (SqlConnection connection = new
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SqlConnection(connectionString)) {
02 SqlCommand cmd = new SqlCommand(queryString, connection);
03 connection.Open();
04
05 while (sdrdr.Read()){
06 // use the data in the reader
07 }
08 }
You need to ensure that the memory is used efficiently when retrieving BLOBs from the database.
Which code segment should you insert at line 04?
A. SqlDataReader sdrdr =
cmd.ExecuteReader();
B. SqlDataReader sdrdr =
cmd.ExecuteReader(CommandBehavior.Default);
C. SqlDataReader sdrdr =
cmd.ExecuteReader(CommandBehavior.SchemaOnly);
D. SqlDataReader sdrdr =
cmd.ExecuteReader(CommandBehavior.SequentialAccess);
Answer: D

1. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET.
You need to ensure that the application can connect to any type of database.
What should you do?
A. Set the database driver name in the connection string of the application, and then create the connection
object in the following manner.
DbConnection connection = new OdbcConnection(connectionString);
B. Set the database provider name in the connection string of the application, and then create the
connection object in the following manner.
DbConnection connection = new OleDbConnection(connectionString);
C. Create the connection object in the following manner.
DbProviderFactory factory =
DbProviderFactories.GetFactory("System.Data.Odbc");
DbConnection connection = factory.CreateConnection();
D. Create the connection object in the following manner.
DbProviderFactory factory =
DbProviderFactories.GetFactory(databaseProviderName);
DbConnection connection = factory.CreateConnection();
Answer: D
2. You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
The application throws an exception when the SQL Connection object is used.
You need to handle the exception.
Which code segment should you use?
A. try
{
if(null!=conn)
conn.Close();
// code for the query
}
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catch (Exception ex)
{
// handle exception
}
finally
{
if(null==conn)
conn.Open();
}
B. try
{
conn.Close();
// code for the query
}
catch (Exception ex)
{
// handle exception
}
finally
{
if(null!=conn)
conn.Open();
}
C. try
{
conn.Open();
// code for the query
}
catch (Exception ex)
{
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// handle exception
}
finally
{
if(null!=conn)
conn.Close();
}
D. try
{
conn.Open();
// code for the query
}
catch (Exception ex)
{
// handle exception
}
finally
{
if(null==conn)
conn.Close();
}
Answer: C