generate barcode image vb.net PART IV in C#

Generating UPC-A Supplement 2 in C# PART IV

PART IV
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A NET button can have an image added to it Notice the graphic to the left of the Delete text on the button This graphic is added by configuring the Image property We have added one of the common bitmaps that are included with the Visual Studio NET installation If you are trying this yourself, you will notice that the graphic appears on top of the text (which we also changed from Buttonx to Delete ) By adjusting the ImageAlign property, you can place the graphic to the left of the text (or wherever you want it to be) TIP Notice the underlined A on the Add button This is created by adding an ampersand (&) in the Text property in front of the character you wish underlined The user can then use the ALT key along with the underlined letter to access the button (instead of clicking on it) To add the code that should be run when the user clicks on the button, double-click the newly designed button You will be taken to the code view of the main form You will see that two things have happened:
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1 The Click event has been registered (or subscribed to) in the InitializeComponent() method:
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thisbtnDeleteClick +=new SystemEventHandler(thisbtnDelete_Click);
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2 The event-handler stub has been created:
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private void btnDelete_Click (Object sender, SystemEventArgs e){ }
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We can add our own code in the Click event that will perform the required Delete operation In 20, we will code this button to remove a record from the database A cool way to determine the valid properties, methods, and events for any control is to type the name of the control in the code view window (for example, btnDelete), and then press the period (), which is also known as the dot operator IntelliSense drops down a list of all the properties, methods, and events for the control You will be able to determine whether a name is for a property, method, or event by observing the icon beside the name The hand holding a piece of paper denotes a property, the flying paper signals a method, and the lightning bolt represents an event A couple properties warrant mentioning: Enabled By setting this property to False, the button will display on the form but will not be capable of receiving any user intervention activities Visible This property determines whether the control will appear on the form or not This is a valuable property, because there will be times that a control should not be visible, and you can control when it is actually displayed programmatically Radio Buttons The look of the radio button is a far cry from the look of the Button class; however, they derive from the same base class, ButtonBase A radio button is used when you want to give the user a choice of two or more mutually exclusive options In our example in the following illustration, the user can choose either Computer Course or C# Course of course, we know they ll choose the C# course!
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19: User-Interface Components
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Notice, in this example, that we have placed the buttons in a GroupBox There are many reasons for doing this: A GroupBox visually keeps all the radio buttons together When you don t use a GroupBox, only one radio button can be selected per form To have multiple areas of selection, you need multiple group boxes When you move the GroupBox, the buttons inside move with it, keeping the controls together Table 19-3 identifies some of the more common properties and events for a RadioButton EXAM TIP A GroupBox is very similar to the Panel control both act as containers for other controls The difference between the two is that a GroupBox has a caption on it and a Panel can have scroll bars Check Boxes A check box allows the user to select an option or answer a question The following illustration shows a check box that has been added to our college application in the Visual Designer The difference between a check box and a radio button has to do with the mutually exclusive options of a radio button With a radio button, you can select only one of the grouped options By using check boxes, you allow the user to select any number of options, and these options could be very different in nature
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