listbox.valuemember throws exception

I have this simple code:

 ListBox1.DataSource = MGlobals.UserList

ListBox1.DisplayMember = "Nome"

ListBox1.ValueMember = "ID"

when setting .ValueMember i get "

System.ArgumentException
  HResult=0x80070057
  Message=Não é possível vincular ao novo membro de apresentação.
Nome do parâmetro: newDisplayMember

"

debugging i found ListBox1.ValueMember holding "" and ListBox1.DisplayMember holding "ID". Can anyone help me? Thanks.

Assuming your datasource Does have the Nome and ID columns, you could try changing the order to something like this:

ListBox1.DisplayMember = "Nome"
ListBox1.ValueMember   = "ID"
ListBox1.DataSource    = MGlobals.UserList