[excel] Get Selected value of a Combobox

I have a thousands of cells in an Excel worksheet which are ComboBoxes. The user will select one at random and populate it.

How do I get the selected ComboBox value? Is there a way to trigger a function (i.e. an event handler) when the ComboxBoxes has been selected?

Maybe you'll be able to set the event handlers programmatically, using something like (pseudocode)

sub myhandler(eventsource)
  process(eventsource.value)
end sub

for each cell
  cell.setEventHandler(myHandler)

But i dont know the syntax for achieving this in VB/VBA, or if is even possible.

You can use the below change event to which will trigger when the combobox value will change.

Private Sub ComboBox1_Change()
'your code here
End Sub

Also you can get the selected value using below

ComboBox1.Value

A simpler way to get the selected value from a ComboBox control is:

Private Sub myComboBox_Change()
  msgbox "You selected: " + myComboBox.SelText
End Sub