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