Clear a combobox in WPF

Question

How do I clear a combobox in WPF? I have tried this code:

 private void btClear1_Click(object sender, RoutedEventArgs e)
    {

        txtID.Text = String.Empty;
        this.cbType.SelectedItem = -1;
    }

Answer 1

cbTypion.SelectedItem = -1 to clear the selection cbType.Items.Clear() to clear all the items