The document discusses various topics related to creating Windows form applications in VB.NET such as adding controls, event handlers, running applications, adding controls at runtime, creating menus, working with multiple forms, inheriting forms, using tab controls, changing startup forms, anchoring controls, list views, creating user controls, using tree view controls, image list controls, and setting image properties. Code examples are provided throughout to demonstrate these concepts.

1. Windows form application in
VB.NET

2. Open new project

3. Form1

4. Adding controls

5. Adding event handler

6. Run the application

7. Application 1: Design the form as given
below

8. Enter following code
• Public Class Form1
• Dim Add As Boolean
• Dim value1, value2 As Double
• Private Sub Form1_Load(sender As Object, e As EventArgs) Handles
MyBase.Load
• End Sub
• Private Sub Button4_Click(sender As Object, e As EventArgs) Handles sum.Click
• value1 = Double.Parse(TextBox1.Text)
• Add = True
• TextBox1.Clear()
• End Sub
• Private Sub Button1_Click(sender As Object, e As EventArgs) Handles one.Click
• TextBox1.Text = TextBox1.Text & 1
• End Sub

9. Cont..
• Private Sub Button2_Click(sender As Object, e As EventArgs) Handles two.Click
• TextBox1.Text = TextBox1.Text & 2
• End Sub
• Private Sub Button3_Click(sender As Object, e As EventArgs) Handles three.Click
• TextBox1.Text = TextBox1.Text & 3
• End Sub
• Private Sub Button6_Click(sender As Object, e As EventArgs) Handles cleart.Click
• TextBox1.Clear()
• End Sub
• Private Sub Button5_Click(sender As Object, e As EventArgs) Handles eq.Click
• value2 = Double.Parse(TextBox1.Text)
• If Add = True Then
• TextBox1.Text = value1 + value2 & "" 'Val1 & val2 are doubles, as textbox supports string we
need to convert val1+val2 to string so we have just added "" to convert it into a string
• Add = False
• End If
• End Sub
• End Class

10. Run the application

11. Adding controls at run time:Open new
form

12. Adding controls at run time: Double
click on the form1 and write the
following code
• Public Class Form1
• Private t1 As New TextBox
• Private Sub Form1_Load(sender As Object, e As EventArgs) Handles
MyBase.Load
• t1.Location = New Point(10, 20)
• t1.Size = New System.Drawing.Size(150, 250)
• t1.Text = "hello"
• Controls.Add(t1)
• End Sub
• End Class

13. Run the application

14. Form1

15. Adding a button at runtime
• Public Class Form1
• Dim btn1 As New Button()
• Dim t1 As New TextBox
• Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
• ' creating control
• t1.Location = New Point(30, 40)
• t1.Size = New System.Drawing.Size(100, 100)
• t1.Text = ""
• btn1.Name = "btn1"
• btn1.Top = 10
• btn1.Text = "Btn1"
• Controls.Add(t1)
• Controls.Add(btn1)
• 'adding handler for click event
• AddHandler btn1.Click, AddressOf show1
• End Sub
• Private Sub show1(ByVal sender As Object, ByVal e As EventArgs)
• t1.Text = "hello"
• End Sub
•
• End Class

16. Cont..

17. Problem 1: The form should appear as
shown below

18. Menu

19. Creating a menu

20. Cont..

21. Run the Application

22. Cont..

23. Working with Multiform

24. Creating second form

25. Run the Application

26. Reading data from one form to
another:Form1

27. Creating form2

28. Code for the form1

29. Code for the form2

30. Run the application

31. Form Inheritance: Derived form

32. Base form

33. Double click on the form1:Derived
form

34. Run the application

35. Tab control

36. Add forth tab:code

37. Run the application:Use control
key+tab to switch between tabs

38. Changing the startup form

39. Open project menu

40. Change the startup form

41. Run the application

42. Anchor property in vb.net: Changing
position of the control

43. Run the application

44. List view

45. Cont..

46. Cont..

47. cont..

48. To remove item

49. Cont..

50. Creating User control

51. Open project

52. Cont..

53. Cont..

54. Drag and drop a text box from the
toolbox to the mycontrol1

55. Build solution and open the form in design view: Your
control will appear on the top of the toolbox

56. Now drag and drop the control from
the toolbox to the form

57. Example 1

58. Code for the property
• Public Class Student_info
• Dim msg As String
• Property text1() As String
• Get
• Return msg
• End Get
• Set(value As String)
• msg = value
• End Set
• End Property
• Private Sub Student_info_Load(sender As Object, e As EventArgs)
Handles MyBase.Load
• TextBox1.Text = text1
• End Sub
• End Class

59. Run the application

60. The TreeView Control
• A TreeView control displays a hierarchy of
nodes, which may include child nodes.
Windows Explorer, which uses a tree view in
its left pane to display the hierarchy of folders
stored on the hard disk of a computer, is an
example of the implementation of the
TreeView control. Figure shows a TreeView
control

61. Tree view

62. Cont..
• A TreeView control can also display the hierarchy of nodes with
checkboxes placed next to the nodes of the tree structure if the
TreeView’s CheckBoxes property is set to True.
• You can then check or uncheck the nodes to select or deselect them
by setting the node’s Checked property to True or False.
• The main properties of tree views are Nodes and SelectedNode.
The Nodes property contains a list of nodes in the tree view, and
the SelectedNode property specifies the currently selected node.
• Nodes themselves are supported by the TreeNode class. A node
can be a parent of other child nodes, called TreeNode objects. You
can add, remove, or clone a TreeNode object, which in turn can also
contain a collection of other TreeNode objects. The FullPath
property specifies the nodes in terms of their absolute locations.

63. You can add nodes to a TreeView control through the Nodes property. The
Nodes property in the Properties window enables you to open the TreeNode
Editor dialog box, as shown in Figure

64. Tree view control form

65. Cont..
• An alternative to display the checkboxes beside the nodes in a TreeView
control is shown in the following code
• snippet:
• private void button1_Click(object sender, EventArgs e)
• {
• treeView1.CheckBoxes = true;
• }

66. The ImageList Control
• An ImageList control is used to store images; i.e., it acts as a kind of image
repository. Various controls are used to work with an ImageList control,
such as list views, tree views, toolbars, tab controls, checkboxes, buttons,
radio buttons, and labels.
• You can associate an ImageList control with its ImageList property and
specify the images you want to display in the control by using the
ImageIndex property. The images in an ImageList control are indexed—
starting at zero—and you can switch the image displayed in a control at
runtime by changing the value of the ImageIndex property.
• The main property in the ImageList control is Images, which contains the
images to be used by the control. The ColorDepth property of the
ImageList control determines the number of colors with which an image is
rendered. Note that images are displayed in the size set by the ImageSize
property. This property is set to 16×16 pixels by default (the size of a small
icon) and needs to be changed when the images are loaded into an
• image list.

67. Properties of image list

68. Cont..

69. Cont..
• To add an image list to the ImageList control,
you should use the Images property in the
Properties window.
• The Images property enables you to open the
Images Collection Editor dialog box, as shown
in Figure

70. Example 1

71. Cont..

72. Run the Application

73. Example 2

74. Cont..

75. Run the application

76. Image property

77. Cont..
• you can see the Add and Remove buttons
used to add or delete an image to an
ImageList control.
• You can resize the images in the ImageList (the
default is 16×16 pixels, the size of a small icon)
control by using the ImageSize property in the
Properties window.