n WinForms Controls in Detail in Visual Basic .NET

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9 n WinForms Controls in Detail
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for displaying and editing this data The form is currently not being displayed Outline the code you would write to allow a user to edit the customer data You can assume the form has buttons assigned to its AcceptButton and CancelButton properties and can be used as a dialog box Create the form, place the variables on to the appropriate controls on the form, show the form as a dialog and then, if the dialog result was OK, copy the values on the controls back to the appropriate variables 4 A list box is to have 1000 items added to it from a database Which methods would you use to make sure that the update went as fast as possible Either set the DataSource property of the list box to an ArrayList that contains the data (or a speci c column in the database see 12), or move the data into an array and use the AddRange method of the list box How is the user informed where the drop part of a drag and drop operation can be done on a form The mouse cursor changes as it moves over controls that can be dropped on this is controlled by setting the Effect property of the DragEventArgs argument in a DragEvent What is the purpose of the Sender parameter in a control s event handlers What is the purpose of the e parameter The Sender parameter indicates which control raised the event (eg which button was pressed) The e parameter provides access to further information, such as the mouse cursor location, key pressed or whatever The Controls collection of a form allows programmatic access to all of the controls placed on the form What type of code structure would you use to access each control in turn How would you modify this structure so that you only accessed TextBox controls For Each is the most ef cient You could place an IfThen block inside the ForEach and check the Type or TypeName of each control, accepting only TextBox controls What options are there for providing information in a menu item apart from the menu text A menu item can be greyed-out (using the Enabled property), made invisible (using the Visible property), checked or made a visible member of a group of menu options How do the Checked properties of a CheckBox and a RadioButton differ in the way they are normally used How does the Checked property of a RadioButton differ from the RadioCheck property in a MenuItem A CheckBox s Checked property indicates a true or false value that is independent of other controls In a group of RadioButtons, the Checked properties are interdependent In a menu item, the RadioCheck property is not interdependent with other menu items and must be switched on and off in code
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10 How do you set which property of an item in a ListBox is displayed What are the options and what is the default Set the DisplayMember property of the ListBox to nominate a property of items added to the list, or leave this property blank and the list box will display the result of an object s ToString() method The ToString() method is the default 11 List three ways in which items can be added to a ListBox or ComboBox control Individually, using the ItemsAdd() method, in batches, using the
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ItemsAddRange() method, or by setting the DataSource property to indicate an ArrayList or an ArrayList property of some object
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12 How would you determine the number of selected item in a ListBox Using the Count property of the SelectedItems property ie ListBoxSelectedItemsCount 13 How does the SubItems property of a ListViewItem object differ from the Items property of a ListView control Each ListViewItem can have a list of SubItems SubItems cannot
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