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Limpar ComboBox

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Olá,
tenho uma combobox que é preenchida no load da seguinte form

      dtConsultor = bd.ReadAllSorted("Utilizadores", "Nome")
        CmbConsultor.DisplayMember = "Nome"
        CmbConsultor.ValueMember = "username"
        CmbConsultor.DataSource = dtConsultor
acontece que queria que quando o form abrisse a combobox não tivesse nenum item seleccionado (combo.text=""), já fiz CmbConsultor.selectedindex = -1 logo a seguir ao CmbConsultor.DataSource = dtConsultor , mas continua a abrir com o primeiro registo seleccionado. Alguma sugestão?

Abrs

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