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Question 19: 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.
The application uses a DataTable named OrderDetailTable that has the following columns:
ID
OrderID
ProductID
Quantity
LineTotal
Some 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 column = new DataColumn("UnitPrice", typeof(double));
02 ...
03 OrderDetailTable.Columns.Add(column);
You need to add a calculated DataColumn named UnitPrice to the OrderDetailTable object.
You also need to ensure that UnitPrice is set to 0 when it cannot be calculated.
Which code segment should you insert at line 02?
A. column.Expression = "LineTotal/Quantity";
B. column.Expression = "LineTotal/ISNULL(Quantity, 1)";
C. column.Expression = "if(Quantity > 0, LineTotal/Quantity, 0)";
D. column.Expression = "iif(Quantity > 0, LineTotal/Quantity, 0)";
Correct Answer: D
