generate barcode image vb.net MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide in Visual C#

Draw UPC A in Visual C# MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide

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Event Description
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Click DoubleClick Enter OnFocus
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KeyDown KeyPress
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KeyUp Leave LostFocus MouseDown MouseEnter MouseHover MouseLeave MouseUp Move Validated Table 19-2
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Fires when the control is clicked This can be the result of a mouse click or the ENTER key being pressed when the control has focus Triggers when the mouse is double-clicked over the control Occurs when the control is entered Triggers when the control gets focus either by the user tabbing to the control or clicking on the control This can also occur programmatically by setting focus on the control Fires when a key is pressed when the control has focus Fired after KeyDown, which occurs when a control that has focus receives a keypress You can retrieve the character that was pressed by examining the KeyChar property of the KeyEventArgs parameter By using the KeyPress event, you can tell whether any of the modifier keys were also pressed (CTRL, SHIFT, ALT) Occurs when a key is released Occurs when the control is exited (or left) Occurs when the control loses focus (when the user tabs or clicks on another control) A series of events that occurs when mouse actions take place MouseDown and MouseUp happen when the mouse button is pressed and released By using the Button property of the MouseEventArgs parameter, you can determine which mouse button was pressed (right, left, or middle) Occurs when the control is moved Triggers when the control is finished validating We will look at validation events later in this chapter
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Common Events for all Controls
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Keep in mind that these are just some of the common events that can occur Each control will have its own list of specific events that have been created just for it For example, the Timer control has a Tick event that is unique to it
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Buttons, Text Boxes, and Labels, Oh My!
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Probably the most common of all controls, buttons, text boxes, and labels are the basic user-interaction controls By clicking a button, a user can request a certain action; by typing in the text box, a user can present data to the program; and by reading the contents of a label, a user is prompted by its value New to the NET Framework is the LinkLabel, which allows you to create a label that contains a hyperlink, and the RichTextBox, which permits formatted text
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Buttons
Including buttons on your form allows the user to select an activity There are three different kinds of buttons that you can employ the regular Click here type of button, a radio button, and a check box It may seem strange that we include radio buttons and
19: User-Interface Components
check boxes in the button category, but that is because they all derive from the class ButtonBase (a subclass of Control) We will return to the discussion of radio buttons and check boxes in a few minutes, but for now, let s concentrate on the standard Button class To add a new button to your form, either double-click on the Button icon in the Toolbox or click it once and draw the button on your form Once the button is added to your form, you should immediately change its name property from Buttonx, where x is the sequentially assigned number of buttons already on the form, to something meaningful like btnDelete The following illustration demonstrates our row of buttons on the main form of our college application You should then change the Text value from Buttonx to the visual clue for the user (that is, Delete) Double-click on the new button and you will be taken to the Click event You can then code whatever needs to be done when the user clicks on the button
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