Chapter 03 - Program Coding and Design

Microsoft Visual Basic 2010

CHAPTER THREE

Program Design and Coding

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Chapter 3: Program Design and Coding 2

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

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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

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BackColor Property

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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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Sizing an Image

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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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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

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Entering Visual Basic Code for Event Handling

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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

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General Format of a Visual Basic Statement

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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

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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

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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

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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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Comments in Program Statements

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Same Line Comments

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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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Introductory Comments

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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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►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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Additional Click Events

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

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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

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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

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Event Planning Document

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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

Technology

Transcript of Chapter 03 - Program Coding and Design