I need help on this, how can I prevent user from changing the selection of item from the dropdown list? what I am trying acheive is this, when user clicks the down button on the combo box or uses down arrow key, I want to be able track it and based on some logic I want to be able to disallow the user from changing the selected item.

Thank you,

Jesbert

hi vkh75

thank for your suggestion, unfortunately, my logic required that I need to prevent selection change ... what happen is that the selectedValuewas used to link to other controls and do some complex works.when user acciedentally change the selectedindex again ... this complex works would be lost ... so I will like to trap the selectedindex change and offer user the choice of "are you sure you want to lost this works .." and if user reply as "no", then I should prevent the selectedindex to change ... the problem I faced is I can only be notified when selectedindex is changed ... which is too late ..

One more try:

Dim i As Integer

Private Sub cbo_DropDown(ByVal o As Object, ByVal e As System.EventArgs) Handles cbo.DropDown

     i = Me.cbo.SelectedIndex

End Sub

Private Sub cbo_DropDownClosed(ByVal o As Object, ByVal e As System.EventArgs) Handles cbo.DropDownClosed

If MessageBox.Show("Do you want to cancel?", "", MessageBoxButtons.YesNo) = Windows.Forms.DialogResult.Yes Then

     Me.cbo.SelectedIndex = i

End If

End Sub

Hi again ... not sure if there is any better way? I use cbo.Enter method instead of dropdown because keydown also can result in changes (without firing the dropdown) ... so at the end, I need cbo.enter to capture the original index, then trap the dropdownclosed and keydown event to prompt for confirmation ... really hope that there is a better way to do it ..