Add, remove and clear list box items : ListBox « GUI « VB.Net
Add, remove and clear list box items
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Public Class MainClass
Shared Sub Main()
Dim myform As Form = New FrmListBox()
Application.Run(myform)
End Sub ' Main
End Class
Public Class FrmListBox
Inherits Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
' contains user-input list of elements
Friend WithEvents lstDisplay As ListBox
' user input textbox
Friend WithEvents txtInput As TextBox
' add, remove, clear and exit command buttons
Friend WithEvents cmdAdd As Button
Friend WithEvents cmdRemove As Button
Friend WithEvents cmdClear As Button
'Required by the Windows Form Designer
Private components As System.ComponentModel.Container
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.cmdClear = New System.Windows.Forms.Button()
Me.cmdAdd = New System.Windows.Forms.Button()
Me.txtInput = New System.Windows.Forms.TextBox()
Me.cmdRemove = New System.Windows.Forms.Button()
Me.lstDisplay = New System.Windows.Forms.ListBox()
Me.SuspendLayout()
'
'cmdClear
'
Me.cmdClear.Location = New System.Drawing.Point(160, 144)
Me.cmdClear.Name = "cmdClear"
Me.cmdClear.Size = New System.Drawing.Size(104, 40)
Me.cmdClear.TabIndex = 4
Me.cmdClear.Text = "Clear"
'
'cmdAdd
'
Me.cmdAdd.Location = New System.Drawing.Point(160, 48)
Me.cmdAdd.Name = "cmdAdd"
Me.cmdAdd.Size = New System.Drawing.Size(104, 40)
Me.cmdAdd.TabIndex = 2
Me.cmdAdd.Text = "Add"
'
'txtInput
'
Me.txtInput.Location = New System.Drawing.Point(160, 8)
Me.txtInput.Name = "txtInput"
Me.txtInput.Size = New System.Drawing.Size(104, 20)
Me.txtInput.TabIndex = 1
Me.txtInput.Text = ""
'
'cmdRemove
'
Me.cmdRemove.Location = New System.Drawing.Point(160, 96)
Me.cmdRemove.Name = "cmdRemove"
Me.cmdRemove.Size = New System.Drawing.Size(104, 40)
Me.cmdRemove.TabIndex = 3
Me.cmdRemove.Text = "Remove"
'
'lstDisplay
'
Me.lstDisplay.Location = New System.Drawing.Point(16, 8)
Me.lstDisplay.Name = "lstDisplay"
Me.lstDisplay.Size = New System.Drawing.Size(120, 238)
Me.lstDisplay.TabIndex = 0
'
'FrmListBox
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdClear, Me.cmdRemove, Me.cmdAdd, Me.txtInput, Me.lstDisplay})
Me.Name = "FrmListBox"
Me.Text = "ListBoxTest"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub cmdAdd_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles cmdAdd.Click
lstDisplay.Items.Add(txtInput.Text)
txtInput.Text = ""
End Sub
Private Sub cmdRemove_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles cmdRemove.Click
If lstDisplay.SelectedIndex <> -1 Then
lstDisplay.Items.RemoveAt(lstDisplay.SelectedIndex)
End If
End Sub
Private Sub cmdClear_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles cmdClear.Click
lstDisplay.Items.Clear()
End Sub ' cmdClear_Click
End Class
