Chapter 3. Working With Procedures, Exceptions, and Arrays
In This Chapter
Working with Sub procedures
Using Function procedures to best effect
Examining the nuances of parameters
Dealing with exceptions
Getting arrays to work right
This chapter introduces you to three individually important but unrelated aspects of Visual Basic.Net (VB.NET) programming: procedures and functions, exceptions, and arrays.
A procedure is a group of sequential statements that have a name in common — and can be executed by calling the group (by name, of course) from some other place in the program. VB.NET lets you use two distinct types of procedures:
Sub procedures and
Function procedures. The difference between the two is that a
Function procedure returns a calculated value, while a
Sub procedure doesn’t return a value.
Sub procedures are used extensively in ASP.NET to handle events such as the
Load event for a page or the
Click event for a button. In addition, you can create your own
Function procedures. This often helps you simplify your code by enabling you to break a long
Sub procedure into several shorter
Sub procedures are often called subroutines, and both
Function procedures are often called methods. The only difference between a Sub procedure and a Function procedure is that a Function procedure returns a value, while a Sub procedure does not.
Another highly useful (okay, indispensable) aspect of VB.NET programming is handling exceptions. This ...