PART IV in C#.NET

Paint GS1 - 12 in C#.NET PART IV

PART IV
UCC - 12 Creator In C#.NET
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Recognizing UPC-A In C#.NET
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In our example (in the preceding illustration), you can see that the check box is in an indeterminate state (the check mark is grayed out) This is a common practice with Windows applications The check box can be selected (with a dark check mark), unselected (no check mark), or unchanged (indeterminate) By default, however, you only allow
Drawing Bar Code In C#
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Reading Bar Code In Visual C#.NET
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
Encode UPC-A Supplement 5 In .NET Framework
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UPC-A Supplement 2 Generation In Visual Studio .NET
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Name Description
UPC Code Printer In Visual Basic .NET
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Printing Linear Barcode In C#.NET
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Properties
Creating Matrix Barcode In C#.NET
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Generating Data Matrix In Visual C#
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Appearance AutoCheck Checked
GS1 - 12 Maker In C#.NET
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International Standard Book Number Creator In Visual C#.NET
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Events
Print UCC - 12 In None
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Scanning UPC Symbol In Visual Basic .NET
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AppearanceChanged CheckedChanged
Creating ANSI/AIM Code 128 In VB.NET
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Create GS1 - 13 In Java
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Click Table 19-3
2D Barcode Maker In Java
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Scanning Barcode In C#
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A RadioButton can be displayed either as seen in the preceding illustration or as a simple click button The RadioButton will automatically change its state (on or off) when it is clicked You can test whether the button has been selected by determining the True/False value of Checked This event occurs when the Appearance property value changes This event is fired when the Checked property value changes When a radio button is clicked, this event happens twice once to the button that was previously checked and once to the button that is now checked When a radio button is selected, the Click event fires once
Painting EAN 128 In .NET Framework
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Code 39 Full ASCII Generation In None
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Properties and Events of a RadioButton
two options selected or unselected In order to add in the indeterminate feature, you must do two things: Set the CheckState property to Indeterminate Set the ThreeState property to True To display the check mark as a default value, set the Checked property to True Let s look at the code that would toggle the CheckBox Checked property
private void btnToggle_Click (object sender, SystemEventArgs e) { if ((cbTest1CheckState == CheckStateChecked) || (cbTest1CheckState == CheckStateUnchecked)) cbTest1CheckState = CheckStateIndeterminate; if (cbTest1CheckState == CheckStateIndeterminate) cbTest1CheckState = CheckStateChecked; }
As you can see in this example, there are enum files (such as CheckState) that allow us to use alphanumeric values to compare states (cbTest1CheckState == CheckStateUnchecked) Always check with the Object Browser (View | Other Windows | Object Browser) for these convenient classes
Text Boxes
When you need the user to enter a value into your application, you can make use of a TextBox The control derives from the TextBoxBase class You will also find a RichTextBox control extending from TextBoxBase, which allows you to provide
19: User-Interface Components
formatted text in a text box We will also discover later in this chapter that we can use the text boxes to force the user to enter a certain kind of data For example, you may want to ensure that only numeric values are entered into the text box in the Validating User Input section of this chapter, we will look at this capability in detail Let s look at some of the more interesting properties of the TextBox class: CharacterCasing Allows you to set whether the text that is entered is in lowercase, uppercase, or remains the way it was typed The default value is Normal MaxLength Allows you to set the maximum number of characters to be entered into the TextBox By default, the only practical limit is the amount of memory in the host machine Multiline Allows the control to display multiple lines of text ScrollBars Allows you to specify that the control will show the scroll bars if the control is also set to display multiple lines of text PasswordChar Replaces the typed characters with a special password character For example, most password boxes display asterisks (*) over the typed password for security reasons ReadOnly Sets the TextBox to be a read-only text box The user will be unable to change the value in the TextBox WordWrap Specifies that words will wrap if the text in the control exceeds the width of the control Used for multiple-line text boxes One of the nicer features of a TextBox is its ability to provide validation code We will examine this later in the chapter just keep in mind that most of the events that you will use for a TextBox belong to the validation type Rich Text Boxes The RichTextBox class uses a standard for displaying formatted text strings called Rich Text Format (RTF) This allows you to utilize formatting, such as bold, italic, and underlining Some properties are supported via the base class and some are new to the RichTextBox: Redo and Undo Allows you to specify a True/False value that lets the user undo or redo their keystrokes DetectUrls Specifies that a URL will be treated as such and display as an underlined link SelectedRtf Allows the user to cut and paste between your application and an application such as Microsoft Word and have the Rich Text Formatting retained between applications This is just a sampling of some of the features of a RichTextBox Figure 19-1 illustrates our application with a RichTextBox added We have added a Button control
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