vb.net - how to display flash message to ask select a list from listbox -


Can you guys see this code for me? I would like to try to display a flash message if the user does not select an option from the listboxes 

  public sub BTNHVAClick (By-space as the system. Object, Bye-way system.AventErgues) BTNHVM Handles .Visible = True Code = ListBoxHVM.SelectedValue If the code = "" then the slow message string = "Please select" message box. Show (message) if the code = "B" then select B1 (station) SelectB2 (station) termination if code = "A" then select A1 (station) Select A2 (site )A 3 () end if end  
 
 You  ListBoxHVM.SelectedValue  code   
  code = ListBoxHVM.SelectedValue   
 edit 2  
  if code = "" then

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