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Microsoft Visual Basic 2005
CHAPTER 3
Program Design and Coding
3
Chapter 3: Program Design and Coding 2
Objectives
►Change the BackColor
property of an object►Add images to a PictureBox
object
►Locate and save an image from the World Wide Web
►Import an image into the Program Resources folder
►Size an image
3
Chapter 3: Program Design and Coding 3
Objectives
►Set the Visible property in the Properties window►Set the Enabled property in the Properties
window►Run a Visual Basic 2005 program►Enter Visual Basic 2005 code►Understand Visual Basic 2005 code statement
formats
3
Chapter 3: Program Design and Coding 4
Objectives
►Use IntelliSense to enter Visual Basic 2005 code statements
►Using code, set the Visible property of an object►Using code, set the Enabled property of an object►Enter comments in Visual Basic 2005 code
3
Chapter 3: Program Design and Coding 5
Objectives
►Correct errors in Visual Basic 2005 code►Write code to use the Close() procedure►Print code►Prepare an Event Planning Document
3
Chapter 3: Program Design and Coding 6
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 until the Cornsilk
color is displayed in the list of colors
►Click Cornsilk
on the color list
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Chapter 3: Program Design and Coding 7
BackColor Property
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Chapter 3: Program Design and Coding 8
Locating and Saving an Image from the World Wide Web
►Open your Internet browser. Then, enter scsite.com/vb2005/ch3/images in the Address box and press the ENTER key
►Locate the StandardRoom.jpg
image and then right-click the image
►Click Save Picture As on the shortcut menu►Identify the drive and folder where the image will
be stored. Enter the image file name, StandardRoom, in the File name text box
►Click the Save button in the Save Picture dialog box to save the image in the selected location
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Chapter 3: Program Design and Coding 9
Locating and Saving an Image from the World Wide Web
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Chapter 3: Program Design and Coding 10
Importing the Image into the Program Resources Folder
►With Visual Studio 2005 and the Hotel Room Selection Visual Basic program open, select the picStandardRoom
PictureBox
object by clicking it. Scroll in the PictureBox Properties window until the Image property is visible. Click
the Image property name in the left list in the Properties window
►Click the Ellipsis button in the right column of the Image property
►Click the Import button in the Select Resource dialog box. Then, using the features of the Open dialog box, locate the file you want to import into the program
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Chapter 3: Program Design and Coding 11
Importing the Image into the Program Resources Folder
►Click the Open button in the Open dialog box►With the StandardRoom
file name selected in the
Project resource file list, click the OK button in the Select Resource dialog box
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Chapter 3: Program Design and Coding 12
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
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Chapter 3: Program Design and Coding 13
Sizing an Image
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Chapter 3: Program Design and Coding 14
Visible Property
►If necessary, select the picStandardRoom PictureBox
object. Scroll in the Properties window
until the Visible property is displayed. Click the Visible property name in the left column, and then click the Visible arrow in the right column of the Visible property
►Click False on the Visible property list
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Chapter 3: Program Design and Coding 15
Visible Property
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Chapter 3: Program Design and Coding 16
Enabled Property
►Select the btnSelectRoom
object. Scroll in the Properties window until the Enabled property is displayed. Click the Enabled property name in the left column, and then click the Enabled arrow in the right column of the Enabled property
►Click False on the Enabled property list
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Chapter 3: Program Design and Coding 17
Enabled Property
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Chapter 3: Program Design and Coding 18
Running a Program
►Point to the Start Debugging button on the Standard toolbar
►Click the Start Debugging button on the Standard toolbar
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Chapter 3: Program Design and Coding 19
Entering Visual Basic Code for Event Handling
►With Visual Studio 2005 and the Hotel Room Selection program open and the Form1.vb[Design] tabbed window visible, point to the Standard Room Button object in the Windows Form object
►Double-click the Standard Room Button object
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Chapter 3: Program Design and Coding 20
Entering Visual Basic Code for Event Handling
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Chapter 3: Program Design and Coding 21
Visual Basic 2005 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
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Chapter 3: Program Design and Coding 22
General Format of a Visual Basic Statement
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Chapter 3: Program Design and Coding 23
IntelliSense
►IntelliSense displays all allowable entries you can make in a Visual Basic statement each time a dot, equal sign, or other special character required for the statement is typed
►You must use the word, Me, followed by a dot before the name of the object, to take full advantage of IntelliSense
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Chapter 3: Program Design and Coding 24
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 me 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 pics 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
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Chapter 3: Program Design and Coding 25
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
►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
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Chapter 3: Program Design and Coding 26
Entering a Visual Basic Statement
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Chapter 3: Program Design and Coding 27
Setting the Visible Property to False
►With the insertion point on the second line of the coding window for the click event of the Standard Room button, type me. on your keyboard
►Type picd to highlight the picDeluxeRoom
entry in the IntelliSense list
►Press the key on the keyboard for the character that is to follow the object name. In this case, press the PERIOD key
►Press the SPACEBAR, press the EQUAL SIGN key, and then press the SPACEBAR
►Type f and then press the ENTER key
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Chapter 3: Program Design and Coding 28
Setting the Visible Property to False
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Chapter 3: Program Design and Coding 29
Enabled Property
►Type me. to display the IntelliSense list►Type btnse until IntelliSense highlights the
btnSelectRoom
entry in the list►Type a period, type e, press the SPACEBAR,
press the EQUAL SIGN key, press the SPACEBAR again, and then type t to select True in the IntelliSense list
►Press the ENTER key to enter the completed statement and place the insertion point on the next line
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Chapter 3: Program Design and Coding 30
Enabled Property
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Chapter 3: Program Design and Coding 31
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
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Chapter 3: Program Design and Coding 32
Comments in Program Statements
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Chapter 3: Program Design and Coding 33
Same Line Comments
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Chapter 3: Program Design and Coding 34
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
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Chapter 3: Program Design and Coding 35
Introductory Comments
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Chapter 3: Program Design and Coding 36
Introductory Comments
►You can enter the remaining comments using the same techniques
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Chapter 3: Program Design and Coding 37
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
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Chapter 3: Program Design and Coding 38
Correcting Errors in Code
►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
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Chapter 3: Program Design and Coding 39
Correcting Errors in Code
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Chapter 3: Program Design and Coding 40
Additional Click Events
►On the Form1.vb [Design] tabbed page, double- click the Exit Window Button object
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Chapter 3: Program Design and Coding 41
Close Procedure
►With the insertion point positioned as shown in Figure 3-64 on page 154, type me. to display the IntelliSense list. Type cl to highlight Close in the IntelliSense list
►Press the ENTER key
3
Chapter 3: Program Design and Coding 42
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
Chapter 3: Program Design and Coding 43
Event Planning Document
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Chapter 3: Program Design and Coding 44
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
3
Chapter 3: Program Design and Coding 45
Summary
►Change the BackColor
property of an object►Add images to a PictureBox
object
►Locate and save an image from the World Wide Web
►Import an image into the Program Resources folder
►Size an image
3
Chapter 3: Program Design and Coding 46
Summary
►Set the Visible property in the Properties window►Set the Enabled property in the Properties
window►Run a Visual Basic 2005 program►Enter Visual Basic 2005 code►Understand Visual Basic 2005 code statement
formats
3
Chapter 3: Program Design and Coding 47
Summary
►Use IntelliSense to enter Visual Basic 2005 code statements
►Using code, set the Visible property of an object►Using code, set the Enabled property of an object►Enter comments in Visual Basic 2005 code
3
Chapter 3: Program Design and Coding 48
Summary
►Correct errors in Visual Basic 2005 code►Write code to use the Close() procedure►Print code►Prepare an Event Planning Document
Microsoft Visual Basic 2005
CHAPTER 3 COMPLETE
Program Design and Coding
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