Chapter 03 - Program Coding and Design

Microsoft Visual Basic 2010

CHAPTER THREE

Program Design and Coding

3 Objectives

►Change the BackColor property of an object
►Understand Visual Basic 2010 code statement formats
►Use IntelliSense to enter Visual Basic 2010 code
statements
►Correct errors in Visual Basic 2010 code
►Write code for an object
►Print code
►Prepare an Event Planning Document

Chapter 3: Program Design and Coding 2

3 BackColor Property

►Click the Windows Form object to select it
►If necessary, scroll in the Properties window until the
BackColor property is displayed, and then click the
right column of the BackColor property
►Click the BackColor arrow. Then, if necessary, click
the Web tab to display the Web tabbed page
►Scroll to display the color you wish to apply
►Click the color you wish to apply on the color list


3 BackColor Property


3 Sizing an Image

►With the PictureBox object containing the
StandardRoom image selected, scroll in the
picStandardRoom Properties window until you see the
SizeMode property. Click the SizeMode property
name in the left column and then click the SizeMode
arrow in the right column of the SizeMode property
►Click StretchImage in the SizeMode list


3 Sizing an Image


3 Running a Program

►Point to the Start Debugging button on the Standard
toolbar
►Click the Start Debugging button on the Standard
toolbar


3 Entering Visual Basic Code for Event Handling

►With Visual Studio 2010 and the Hotel Room Selection
program open and the frmHotelRoomSelection.vb
[Design] tabbed window visible, point to the Standard
Room Button object in the Windows Form object
►Double-click the Standard Room Button object


3 Entering Visual Basic Code for Event Handling


3 Visual Basic 2010 Coding Statements

►The Visual Basic syntax specifies how each statement
must be written
►When the user clicks the Standard Room button while
the program is running, the standard room image
should be displayed in the picStandardRoom
PictureBox object


3 General Format of a Visual Basic Statement


3 IntelliSense

►IntelliSense displays all allowable entries you can
make in a Visual Basic statement each time a dot
(period), equal sign, or other special character
required for the statement is typed


3 Entering a Visual Basic Statement
► With the code window open and the insertion point positioned
as shown in Figure 3-25 on page 131, type pic followed by a
period
► To identify the correct entry, type the first letters of the entry
until the entry is selected. In this case, type s on your keyboard
► When IntelliSense highlights the correct object name, press the
key on the keyboard corresponding to the entry that is to
follow the object name. In this case, press the PERIOD key
► As with the object name in the second step, the next step is to
enter one or more characters until IntelliSense highlights the
desired property in the list. Type the letter, v on your keyboard


3 Entering a Visual Basic Statement

►Press the key for the character that is to follow the
property name. In this case, press the SPACEBAR on
the keyboard
►Press the EQUAL SIGN key on the keyboard and then
press the SPACEBAR. On the IntelliSense list, click the
Common tab to display the most common results
►Type t on the keyboard
►Press the key for the character that is to follow the
True entry. In this case, press the ENTER key


3 Comments in Program Statements

►To insert a blank line following the event code
generated by Visual Studio that begins with the word,
Private, click anywhere in that line and then press the
END key on your keyboard
►Press the ENTER key
►Type the first line of the comments, beginning with an
apostrophe, as shown in Figure 3-46 on page 143, and
then press the ENTER key


3 Comments in Program Statements


3 Same Line Comments


3 Introductory Comments

►Click to the left of the word, Public, on line 1 in the
program to place the insertion point on that line
►Press the ENTER key one time, and then press the UP
ARROW key one time
►Type an apostrophe, a space, the text, Program
Name: and then press the TAB key one time
►Type Hotel Room Selection as the name of the
program. Then, press the ENTER key


3 Introductory Comments


3 Correcting Errors in Code

►Using IntelliSense reduces the likelihood of coding
errors considerably, although it is still possible to code
an error
• One possible error may be forgetting an
apostrophe in a comment statement
►A build errors message means the Visual Basic
compiler detected a coding error in the program



►Click the No button in the Microsoft Visual Studio
dialog box that informs you of a build error
►Double-click anywhere on the error line
►Click in the leftmost column on line 7 to place the
insertion point at that location
►Type an apostrophe
►Click anywhere in the code editing window


3 Additional Click Events

►On the frmHotelRoomSelection.vb [Design] tabbed
page, double-click the Exit Window Button object


3 Close Procedure

►With the insertion point positioned as shown in Figure
3-64 on page 154, type clo to highlight Close in the
IntelliSense list
►Press the ENTER key


3 Printing Code
►Click File on the menu bar to display the File menu
►Click Print on the File menu to display the Print dialog
box
►Ensure that a check mark appears in the Include line
numbers check box if you want line numbers on your
printout. Most developers prefer line numbers on
printouts
►Make any other selections you find necessary in the
Print dialog box
►Click the OK button in the Print dialog box to print the
code


3 Event Planning Document


3 Phase 4 – Code the Program

►After the events and tasks within the vents have been
identified, the developer is ready to code the program
• Entering Visual Basic statements to accomplish the
tasks specified on the event planning document
►Developer enters the code and implements the logic


Microsoft Visual Basic 2010

CHAPTER THREE
COMPLETE
Program Design and Coding

Chapter 03 - Program Coding and Design

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