Week 2: WINDOWS PROGRAMMING Chapter 15 in “Beginning Visual C# 2010” ebook Chapter 4 in “”MCTS_Self-Paced_Training_Kit” ebook

Week 2: WINDOWS PROGRAMMING Working with Windows Forms

CONTROLS When you work with Windows Forms, you are working with the System.Windows.Forms namespace Most controls in .NET derive from the System.Windows.Forms.Control class Many of these classes are themselves base classes for other controls, as is the case with the Label and TextBoxBase classes Windows Programming 1 Basic Windows Programming Slide 3

CONTROLS Windows Programming 1 Basic Windows Programming Slide 4

Properties Common Control Class Properties Windows Programming 1 Basic Windows Programming Slide 5

Properties Common Control Class Properties Windows Programming 1 Basic Windows Programming Slide 6

Adding Controls to a Windows Form Adding Controls by Using the Windows Forms Designer Adding Controls Programmatically Windows Programming 1 Basic Windows Programming Slide 7

Adding Controls Programmatically 1. Create a private variable to represent each of the controls you want to place on the form 2. In the form, place code to instantiate each control and to customize each control, using its properties, methods, or events. 3. Add each control to the forms control collection. Windows Programming 1 Basic Windows Programming Slide 8

Exam (page 113) Windows Programming 1 Basic Windows Programming Slide 9

Handling Control Events Add controls to a Windows form. Set properties on controls. Load controls dynamically. Write code to handle control events and add the code to a control. Windows Programming 1 Basic Windows Programming Slide 10

Handling Control Events_Ex Windows Programming 1 Basic Windows Programming Slide 11

HANDLING CONTROL EVENTS Windows Programming 1 Basic Windows Programming Slide 12

HANDLING CONTROL EVENTS Windows Programming 1 Basic Windows Programming Slide 13

COMMON WINDOWS FORMS CONTROLS Windows Programming 1 Basic Windows Programming Slide 14

Naming Rules Button-btn Label-lbl Form-frm Always use standard names for objects No spaces or punctuation marks 3 letter lowercase prefix identifies control type Button-btn Label-lbl Form-frm If multiple words capitalize 1st letter of each word Each object name is an identifier Can contain letters, digits, and underscores (_) Cannot start with digits Can start with the at symbol (@) Windows Programming 1 Basic Windows Programming Slide 15

Recommended Naming Object Class Prefix Example Form frm frmDataEntry Button btn btnExit TextBox txt txtPaymentAmount Label lbl lblTotal Radio Button rad radBold CheckBox chk chkPrintSummary PictureBox pic picLandscape ComboBox cbo cboBookList ListBox lst lstIndegredients GroupBox grb grbColor Windows Programming 1 Basic Windows Programming Slide 16

Windows Forms Windows Forms is the basic building block of the UI It provides a container that hosts controls and menus and enables you to present an application in a familiar and consistent fashion You can add and configure additional forms at design time, or you can create instances of predesigned forms in code at run time. Windows Programming 1 Basic Windows Programming Slide 17

Windows Forms Some Properties of the Form Class Windows Programming 1 Basic Windows Programming Slide 18

Windows Forms Some Properties of the Form Class Windows Programming 1 Basic Windows Programming Slide 19

Windows Forms Some Properties of the Form Class Windows Programming 1 Basic Windows Programming Slide 20

Setting the Title of the Form To change the title of a form at run time, set the Text property of the form in code, as shown in the following code: Windows Programming 1 Basic Windows Programming Slide 21

Setting the Border Style of the Form Windows Programming 1 Basic Windows Programming Slide 22

Specifying the Startup Location of the Form Windows Programming 1 Basic Windows Programming Slide 23

Keeping a Form on Top of the User Interface TopMost = True FormBorderStyle = None; StartPosition = CenterToScreen; Windows Programming 1 Basic Windows Programming Slide 24

Opacity and Transparency in Forms The Opacity property to create striking visual effects in your form Values between 0 percent and 100 percent result in a partially transparent form Windows Programming 1 Basic Windows Programming Slide 25

Setting the Startup Form 1. In Solution Explorer, double-click Program.cs to view the code. The code window opens. 2. Locate the Main method and then locate the line that reads: Application.Run(new Form()); where Form represents the name of the form that is currently the startup form. 3. Change Form to the name of the form you want to set as the startup form. Windows Programming 1 Basic Windows Programming Slide 26

Control Properties and Layout Common properties Derive from class Control Text property Specifies the text that appears on a control Focus method Transfers the focus to a control Becomes active control Enable property Indicate a control’s accessibility Windows Programming 1 Basic Windows Programming Slide 27

Control Properties and Layout Visibility control Hide control from user Anchor property Anchoring control to specific location (corner) Unanchored control moves relative to the position Docking allows control to spread itself along and entire side Both options refer to the parent container Windows Programming 1 Basic Windows Programming Slide 28

Control Properties and Layout Before resize After resize Constant distance to left and top sides Fig. 12.11 Anchoring demonstration. Windows Programming 1 Basic Windows Programming Slide 29

Control Properties and Layout Darkened bar indicates to which wall control is anchored Click down-arrow in Anchor property to display anchoring window Fig. 12.12 Manipulating the Anchor property of a control. Windows Programming 1 Basic Windows Programming Slide 30

Control Properties and Layout Control expands along top portion of the form Fig. 12.13 Docking demonstration. Windows Programming 1 Basic Windows Programming Slide 31

Control Properties and Layout Windows Programming 1 Basic Windows Programming Slide 32

Week 2: WINDOWS PROGRAMMING Controls for displaying information to the user

Labels and LinkLabel controls Labels : The standard Windows label LinkLabel: A label similar to the standard one but that presents itself as an Internet link (a hyperlink) You don’t need to add event handling code for a standard Label Some extra code is needed to enable users clicking it to go to the target of the LinkLabel Windows Programming 1 Basic Windows Programming Slide 34

Common Label Control Properties Windows Programming 1 Basic Windows Programming Slide 35

Common Label Control Properties Windows Programming 1 Basic Windows Programming Slide 36

Week 2: WINDOWS PROGRAMMING Controls that enable users of your application to enter text,

TextBoxes and RichTextBox The .NET Framework comes with two basic controls to take text input from users: TextBox and RichTextBox. Both controls are derived from a base class called TextBoxBase, which itself is derived from Control. Windows Programming 1 Basic Windows Programming Slide 38

Common TextBox Control Properties Windows Programming 1 Basic Windows Programming Slide 39

Common TextBox Control Properties Windows Programming 1 Basic Windows Programming Slide 40

THE RICHTEXTBOX CONTROL Like the normal TextBox, the RichTextBox control is derived from TextBoxBase Whereas a TextBox is commonly used for the purpose of obtaining short text strings from the user The RichTextBox is used to display and enter formatted text (e.g., bold, underline, and italic). It does so using a standard for formatted text called Rich Text Format, or RTF. Windows Programming 1 Basic Windows Programming Slide 41

Common RichTextBox Control Properties Windows Programming 1 Basic Windows Programming Slide 42

Common RichTextBox Control Properties Windows Programming 1 Basic Windows Programming Slide 43

Week 2: WINDOWS PROGRAMMING Controls for displaying pictures

The PictureBox Control The PictureBox control is the basic control used for displaying images in the user interface, and it can display pictures in a variety of formats, including .bmp, .jpg, .gif, metafiles, and icons. Windows Programming 1 Basic Windows Programming Slide 45

The PictureBox Control Windows Programming 1 Basic Windows Programming Slide 46

The PictureBox Control At run time, you can set the Image property to an instance of an image, as shown in the following example: Windows Programming 1 Basic Windows Programming Slide 47