2.  What are the different types of loops? ◦ Do….While  Performs statements within loop while a condition is true ◦ Do….Until  Performs statements within loop until a condition is true ◦ For….Next  Performs statements within the loop a pre-determined number of times  Within these there are two styles ◦ Post-test  Code is executed at least once ◦ Pre-test  Code may not get execute.

3.  Can be top controlled or bottom controlled  Top Controlled syntax Do While condition Body of loop Loop  Bottom Controlled syntax Do Body of loop Loop while condition

6.  Much like the Do…While can be top or bottom controlled  Top Controlled Do until condition Body of loop Loop  Bottom Controlled Do Body of loop Loop until condition

7.  You can use a For...Next loop when a section of code is to be executed an exact number of times

9.  Starting a loop with a preset value in the variable(s) tested in the condition is called priming the loop

10. 10  Resolving defects in code is called debugging  Breakpoints allow us to stop the code where ever we want so that we can examine what is going on with our variables.  While in break mode, you can examine the values in all

11. Chapter 6: Loop Structures11  A variable that contains an accumulated value such as the total of all the speeds is called an accumulator  A variable that always is incremented by a constant value is called a counter ◦ How many vehicle speeds the user has entered

12. Chapter 6: Loop Structures12  A compound operator allows you to add, subtract, multiply, divide, use modulus or exponents, or concatenate strings, storing the result in the same variable

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15. 15  A menu bar is a strip across the top of a window that contains one or more menu names  A menu is a group of commands, or items, presented in a list

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17. Chapter 6: Loop Structures17  Work the same for buttons – double click on the menu item and the code window should pop up

18. 18  Action Tag allows you to create a full standard menu bar commonly provided in Windows programs  Can specify a set of actions, called smart actions, for an object as you design a form  To do this place a new MenuStrip object on your form  Click the Action Tag on the MenuStrip object  Click Insert Standard Items on the MenuStrip Tasks menu  Click File on the menu bar to view the individual menu items and their associated icons on the File menu

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20. 20  The InputBox function displays a dialog box, that asks the user for some type of input.  The User can either click on OK or Cancel  When the user enters the text the InputBox function returns this text as a string  If the user clicks the Cancel button, the function returns a null string ("")

21. Chapter 6: Loop Structures21  The InputBox object can be assigned a default value

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23. 23  List boxes can be used to display items for a user to pick from OR receive output from a program

24. 24  Click the Items property in the Properties window  Click the ellipsis button in the right column of the Items property  Click in the String Collection Editor window. Type in whatever values you want and click on the OK button

25.  When we use a list box to display a set of values for the user to pick from, when they pick their item, we need to bring it in to the code

26.  This property returns an integer with the number of entries stored in the Items property  Example of use:  The number of entries in the list can be assigned to an integer variable If lstEmployees.Items.Count = 0 Then MessageBox.Show("The list has no items!") End If numEmployees = lstEmployees.Items.Count

27.  The Items property values can be accessed from your VB code  Each item value is given a sequential index ◦ The first item has an index of 0 ◦ The second item has an index of 1, etc.  Example: name = lstCustomers.Items(2) ' Access the 3rd item value

28.  The SelectIndex property returns an integer with the index of the item selected by the user  If no item is selected, the value is set to -1 (an invalid index value)  Can use SelectIndex to determine if an item has been selected by comparing to -1  Example: If lstLocations.SelectedIndex <> -1 Then location = lstLocations.Items(lstLocations.SelectedIndex) End If

29.  Instead of using the SelectedIndex property as follows:  The SelectedItem property can be used to retrieve the value of a selected item as follows: If lstMonths.SelectedIndex <> -1 Then month = lstMonths.Items(lstMonths.SelectedIndex) End If If lstMonths.SelectedIndex <> -1 Then month = lstMonths.SelectedItem.ToString) End If

30.  Sorted is a boolean property  When set to true, values in the Items property are displayed in alphabetical order  When set to false, values in the Items property are displayed in the order they were added

31.  Items can be added to the end of a ListBox list in your VB code using the Add method  Format is ListBox.Items.Add(Item)  ListBox is the name of the control  Item is a string value to add to the Items property  Example: lstStudents.Items.Add("Sharon")

32.  Items can be added at a specific position of a ListBox in VB code using the Insert method ListBox.Items.Insert(Index, Item)  Index specifies position where Item is placed  Index is zero based similar to SelectedIndex property  Items that follow are “pushed” down  Example inserting "Jean“ as the 3 rd item lstStudents.Items.Insert(2, "Jean")

33.  ListBox.Items.RemoveAt(Index) ◦ Removes item at the specified index  ListBox.Items.Remove(Item) ◦ Removes item with value specified by Item  ListBox.Items.Clear() ◦ Removes all items in the Items property  Examples: lstStudents.Items.RemoveAt(2)‘remove 3 rd item lstStudents.Items.Remove(“Jean”)‘remove item Jean lstStudents.Items.Clear()‘remove all items

34. 34  Right-click where ever you wish to put your breakpoint, point to breakpoint on the short cut menu.  To run and test the program with the breakpoint, click the Start Debugging button on the Standard toolbar  To see the value of the variable hover your mouse over the variable declaration and you will see the current value.

36. 36  To remove a breakpoint, right-click the statement containing the breakpoint, and then point to Breakpoint on the shortcut menu  Click Delete Breakpoint on the Breakpoint submenu

37. 37  After you complete your application, how do we create the executable or deploy it?  Deploying a project means placing an executable version of the program on your hard disk, on a Web server, or on a network server  You can create a deployed program by using ClickOnce Deployment  The deployed version of the program you create can be installed and executed on any computer that has the.NET framework installed

38. 38  With the program open, click Build on the menu bar  Click Publish Radar on the Build menu  Change the default location from publish\ to a file location.  Click the Next button. If necessary, click the From a CD-ROM or DVDROM radio button  Click the Next button. If necessary, click the The application will not check for updates radio button  Click on next and then finish

39. Chapter 6: Loop Structures39  To install the application, double-click the setup file  After installation, the program will run. To run the installed application again, click the Start button on the Windows taskbar. Point to All Programs, click Radar on the All Programs menu, and then click Radar on the Radar submenu

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