Superexam

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