[RESOLVED] Add item to a combobox items collection at run time

[4x2y]

ComboBox1 shows USD, EUR, .... but also numbers 1,2,3....

I guess these numbers are come from my sample code, i think you need to add another button to remove any entry that may added by mistake or no needed anymore, try this

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        If My.Settings.ComboBox1Items.Contains(ComboBox1.Text) Then
            My.Settings.ComboBox1Items.Remove(ComboBox1.Text)

            ComboBox1.Items.Clear()
            For Each s In My.Settings.ComboBox1Items
                ComboBox1.Items.Add(s)
            Next
            If ComboBox1.Items.Count = 0 Then
                ComboBox1.Text = String.Empty
            Else
                ComboBox1.SelectedIndex = 0
            End If
        End If
    End Sub