Beginning ASP.NET 4.5 in CSharp and VB Opsylum

Statements x 169
VB.NET
Dim today As DateTime = DateTime.Now
Dim discountPercentage As Double = 0
Select Case today.DayOfWeek
Case DayOfWeek.Monday
discountPercentage = 40
Case DayOfWeek.Tuesday
discountPercentage = 30
Case DayOfWeek.Wednesday
discountPercentage = 20
Case DayOfWeek.Thursday
discountPercentage = 10
Case Else
discountPercentage = 0
End Select
C#
DateTime today = DateTime.Now;
double discountPercentage = 0;
switch (today.DayOfWeek)
{
case DayOfWeek.Monday:
discountPercentage = 40;
break;
case DayOfWeek.Tuesday:
discountPercentage = 30;
break;
case DayOfWeek.Wednesday:
discountPercentage = 20;
break;
case DayOfWeek.Thursday:
discountPercentage = 10;
break;
default:
discountPercentage = 0;
break;
}
For each day where the discount is applicable (Monday through Thursday) there is a Case block.
The differences between VB.NET and C# syntax are quite small: C# uses a lowercase c for case
and requires a colon after each case label. Additionally, you need to exit each block with a break
statement. At run time, the condition (today.DayOfWeek) is evaluated and the correct block is executed.
It’s important to understand that only the relevant block is executed, and nothing else. When
no valid block is found (the code is executed on a day between Friday and Sunday), the code in the
Case Else or default block fires. You’re not required to write a Case Else or default block,
although it’s recommended to do so because it makes your code more explicit and easier to read.
The preceding examples could have left it out, because discountPercentage already gets a default
value of 0 at the top of the code block.
To get a feel for the statements you have seen so far, the following Try It Out exercise shows you
how to use them in a small demo application.