Detect if a combobox is clicked without using SelectedIndexChange - vb.net

Question

I would like to ask if it is possible for VB.net applications to detect if a combobox has been changed without using SelectedIndexChange.
For Example my application has 4 comboboxes and this comboboxes was dynamically created from the user configuration. (the tool autocreates the comboboxes when the application was launched). Then once the application was launched, I want to run a SUB everytime those comboboxes was changed. Badly needed help. TIA

Answer 1

If you are creating controls dynamically, you should add the event handlers dynamically as well. There is nothing wrong with using the SelectedIndexChanged event.
You can test this by making a new project and pasting this code inside Public Class Form1.
Private myComboBox1 As ComboBox
Private myComboBox2 As ComboBox
Private Shared selectedIndexChanged As EventHandler =
Sub(sender As Object, e As EventArgs)
Dim myComboBox = DirectCast(sender, ComboBox)
' alert the user as to what was selected
MessageBox.Show(String.Format("{0} value: {1}, index: {2}",
myComboBox.Name, myComboBox.Text, myComboBox.SelectedIndex))
' you can do something different on each one by name in a case statement
Select Case myComboBox.Name
Case "myComboBox1"
' do something for 1
Case "myComboBox2"
' do something for 2
End Select
End Sub
Private Sub addHandlers()
AddHandler myComboBox1.SelectedIndexChanged, selectedIndexChanged
AddHandler myComboBox2.SelectedIndexChanged, selectedIndexChanged
End Sub
Private Sub removeHandlers()
RemoveHandler myComboBox1.SelectedIndexChanged, selectedIndexChanged
RemoveHandler myComboBox2.SelectedIndexChanged, selectedIndexChanged
End Sub
Form eventhandlers
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
' dynamically generate combo boxes
myComboBox1 = New ComboBox() With {.Name = "myComboBox1",
.Left = 30,
.Top = 30}
myComboBox2 = New ComboBox() With {.Name = "myComboBox2",
.Left = 30,
.Top = 60}
' add some items
myComboBox1.Items.AddRange({1, 2, 3})
myComboBox2.Items.AddRange({"four", "five", "six"})
' add the combo boxes to the form
Me.Controls.Add(myComboBox1)
Me.Controls.Add(myComboBox2)
' add event handlers
addHandlers()
End Sub
Private Sub Form1_FormClosed(sender As Object, e As FormClosedEventArgs) Handles Me.FormClosed
removeHandlers()
End Sub