Beginning ASP.NET 4.5 in CSharp and VB Opsylum

178 x CHAPTER 5 PROGRAMMING YOUR ASP.NET WEB PAGES
VB.NET
' Define a function
Public Function FunctionName ([parameterList]) As DataType
End Function
' Define a subroutine
Public Sub SubName ([parameterList])
End Sub
C#
// Define a function
public DataType FunctionName([parameterList])
{
}
// Define a subroutine
public void SubName([parameterList])
{
}
The complete first line, starting with Public, is referred to as the method signature because it
defines the look of the function, including its name and its parameters. The Public keyword (public
in C#) is called an access modifier and defines to what extent other web pages or code files can
see this method. This is discussed in detail later in the chapter. For now, you should realize that
Public has the greatest visibility, so the method is visible to any calling code.
The name of the function is followed by parentheses, which in turn can contain an optional parameter
list. The italic parts in these code examples will be replaced with real values in your code. The
parts between the square brackets ([]) are optional. To make it a little more concrete, here are some
examples of functions and subs:
VB.NET
Public Function Add(a As Integer, b As Integer) As Integer
Return a + b
End Function
Public Sub SendEmailMessage(emailAddress As String)
' Code to send an e-mail goes here
End Sub
C#
public int Add(int a, int b)
{
return a + b;
}
public void SendEmailMessage(string emailAddress)
{