Superexam

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