1. Microsoft Visual Basic 2012 CHAPTER THREE Program Design and Coding

2. 3 Chapter 3: Program Design and Coding2 Objectives ► Change the color properties 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. 3 Chapter 3: Program Design and Coding3 Objectives ► Set the Visible property in the Properties window ► Set the Enabled property in the Properties window ► Run a Visual Basic 2012 program ► Enter Visual Basic 2012 code ► Understand Visual Basic 2012 code statement formats

4. 3 Chapter 3: Program Design and Coding4 Objectives ► Use IntelliSense to enter Visual Basic 2012 code statements ► Use code to set the Visible property of an object ► Use code to set the Enabled property of an object ► Enter comments in Visual Basic 2012 code

5. 3 Chapter 3: Program Design and Coding5 Objectives ► Correct errors in Visual Basic 2012 code ► Write code to use the Close() procedure ► Print code ► Prepare an event planning document

6. 3 Chapter 3: Program Design and Coding6 BackColor and ForeColor Properties ► Tap or click the Windows Form object to select it ► If necessary, scroll in the Properties window until the BackColor property is displayed, and then tap or click the right column of the BackColor property ► Tap or click the BackColor arrow. Then, tap or click the Web tab to display the Web tabbed page ► Scroll to display the color you wish to apply ► Tap or click the color you wish to apply on the color list

7. 3 Chapter 3: Program Design and Coding7 BackColor Property

8. 3 Chapter 3: Program Design and Coding8 Locating and Saving an Image from the World Wide Web ► Open your Web browser and navigate to the webpage containing the image you want to save. ► Press and hold or right-click the image, tap or click Save Picture As, and then navigate to the location on your computer where you store downloaded files ► Click the Save button to save the image

9. 3 Chapter 3: Program Design and Coding9 Locating and Saving an Image from the World Wide Web

10. 3 Chapter 3: Program Design and Coding10 Importing the Image into the Program Resources Folder ► With Visual Studio 2012 and the desired program open, select the desired PictureBox object by tapping or clicking it. Scroll in the PictureBox Properties window until the Image property is visible. Tap or click the Image property name in the left list of the Properties window ► Tap or click the ellipsis button in the right column of the Image property ► Tap or click the Import button in the Select Resource dialog box. Use the features of the Open dialog box to locate the file you want to import into the program ► Select the file you want to import

11. 3 Chapter 3: Program Design and Coding11 Importing the Image into the Program Resources Folder ► Tap or click the Open button in the Open dialog box ► Tap or click the OK button in the Select Resource dialog box

12. 3 Chapter 3: Program Design and Coding12 Sizing an Image ► Select the PictureBox object to resize, and then scroll in the Properties window until you see the SizeMode property. Tap or click the SizeMode property name in the left column, and then tap or click the SizeMode arrow in the right column of the SizeMode property ► Tap or click StretchImage in the SizeMode list

13. 3 Chapter 3: Program Design and Coding13 Sizing an Image

14. 3 Chapter 3: Program Design and Coding14 Visible Property ► Select the desired PictureBox object. Scroll in the Properties window until the Visible property is displayed. Tap or click the Visible property name in the left column, and then tap or click the Visible arrow in the right column of the Visible property ► Tap or click False on the Visible property list

15. 3 Chapter 3: Program Design and Coding15 Visible Property

16. 3 Chapter 3: Program Design and Coding16 Enabled Property ► Select the desired object. Scroll in the Properties window until the Enabled property is displayed. Tap or click the Enabled property name in the left column, and then tap or click the Enabled arrow in the right column of the Enabled property ► Tap or click False on the Enabled property list

17. 3 Chapter 3: Program Design and Coding17 Enabled Property

18. 3 Chapter 3: Program Design and Coding18 Running a Program ► Point to the Start Debugging button on the Standard toolbar ► Tap or click the Start Debugging button on the Standard toolbar

19. 3 Chapter 3: Program Design and Coding19 Entering Visual Basic Code for Event Handling ► With Visual Studio 2012 and the desired program open and the [Design] tabbed window visible, point to the desired button object in the Windows Form object ► Double-click the button object

20. 3 Chapter 3: Program Design and Coding20 Entering Visual Basic Code for Event Handling

21. 3 Chapter 3: Program Design and Coding21 Visual Basic 2012 Coding Statements ► The Visual Basic syntax specifies how each statement must be written ► When the user taps or clicks a button while the program is running, an action associated with the coding statement will occur

22. 3 Chapter 3: Program Design and Coding22 General Format of a Visual Basic Statement

23. 3 Chapter 3: Program Design and Coding23 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

24. 3 Chapter 3: Program Design and Coding24 Entering a Visual Basic Statement ► With the code window open and the insertion point positioned where you want to insert the code, type pic followed by a period ► To identify the correct entry, type its next letter until the entry is selected ► When IntelliSense highlights the correct object name, press the key 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 for the Visible property

25. 3 Chapter 3: Program Design and Coding25 Entering a Visual Basic Statement ► Press the key for the character that is to follow the property name. In this case, press the SPACEBAR ► Press the EQUAL SIGN key on the keyboard and then press the SPACEBAR. On the IntelliSense list, tap or click the Common tab to display the most common results ► Type t for True ► Press the key for the character that follows the True entry. In this case, press the ENTER key

26. 3 Chapter 3: Program Design and Coding26 Entering a Visual Basic Statement

27. 3 Chapter 3: Program Design and Coding27 Setting the Visible Property to False ► With the insertion point in the desired location, type pic ► Type the next letter for the button name ► Press the key 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

28. 3 Chapter 3: Program Design and Coding28 Setting the Visible Property to False

29. 3 Chapter 3: Program Design and Coding29 Enabled Property ► Type btn to display the IntelliSense list ► Type additional characters in the button name until IntelliSense highlights the desired 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

30. 3 Chapter 3: Program Design and Coding30 Enabled Property

31. 3 Chapter 3: Program Design and Coding31 Comments in Program Statements ► To insert a blank line following the event code generated by Visual Studio that begins with the word, Private, tap or click anywhere in that line and then press the END ► Press the ENTER key ► Type the first line of the comments, beginning with an apostrophe, and then press the ENTER key

32. 3 Chapter 3: Program Design and Coding32 Comments in Program Statements

33. 3 Chapter 3: Program Design and Coding33 Same Line Comments

34. 3 Chapter 3: Program Design and Coding34 Introductory Comments ► Tap or 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 and then press the UP ARROW key ► Type an apostrophe, a space, the text Program Name: and then press the TAB key one time ► Type the program name and then press the ENTER key

35. 3 Chapter 3: Program Design and Coding35 Introductory Comments

36. 3 Chapter 3: Program Design and Coding36 Correcting Errors in Code ► Using IntelliSense to help you enter code reduces the likelihood of coding errors considerably One possible error would be to forget an apostrophe in a comment statement ► A build errors message means the Visual Basic compiler detected a coding error in the program

37. 3 Correcting Errors in Code Chapter 3: Program Design and Coding37

38. 3 Chapter 3: Program Design and Coding38 Correcting Errors in Code ► Tap or 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 ► Tap or click in the leftmost column on the line containing the error to place the insertion point at that location ► Type an apostrophe ► Click anywhere in the code editing window

39. 3 Chapter 3: Program Design and Coding39 Correcting Errors in Code

40. 3 Chapter 3: Program Design and Coding40 Additional Tap or Click Events ► On the [Design] tabbed page, double-click the Exit Window Button object

41. 3 Chapter 3: Program Design and Coding41 Close Procedure ► With the insertion point positioned where you want the Close statement to appear, type clo to highlight Close in the IntelliSense list ► Press the ENTER key

42. 3 Chapter 3: Program Design and Coding42 Printing Code ► Tap or click FILE on the menu bar to display the File menu ► Tap or 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 needed selections in the Print dialog box ► Tap or click the OK button in the Print dialog box to print the code

43. 3 Chapter 3: Program Design and Coding43 Event Planning Document

44. 3 Chapter 3: Program Design and Coding44 Phase 4 – Code the Program ► After the events and tasks within the events 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

45. 3 Chapter 3: Program Design and Coding45 Summary ► Change the color properties 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

46. 3 Chapter 3: Program Design and Coding46 Summary ► Set the Visible property in the Properties window ► Set the Enabled property in the Properties window ► Run a Visual Basic 2012 program ► Enter Visual Basic 2012 code ► Understand Visual Basic 2012 code statement formats

47. 3 Chapter 3: Program Design and Coding47 Summary ► Use IntelliSense to enter Visual Basic 2012 code statements ► Use code to set the Visible property of an object ► Use code to set the Enabled property of an object ► Enter comments in Visual Basic 2012 code

48. 3 Chapter 3: Program Design and Coding48 Summary ► Correct errors in Visual Basic 2012 code ► Write code to use the Close() procedure ► Print code ► Prepare an event planning document

49. Microsoft Visual Basic 2012 CHAPTER THREE COMPLETE Program Design and Coding