21 使用的Combobox

界面上 一个combobox，一个lbl，会把你选的东西，显示在lbl。
一个btn，添加，把txt里的内容添加到conbo
另一个btn，del，删除你combo的SelectItem

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text <> "" Then
            ComboBox1.Items.Add(TextBox1.Text)
            TextBox1.Text = ""
        End If
    End Sub

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    
        Label1.Text = "你选择了" & ComboBox1.SelectedItem & "！"
            End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        ComboBox1.Items.Remove(ComboBox1.SelectedItem)
    End Sub

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

        ComboBox1.Items.Insert(3, "Ada")
        ComboBox1.Items.Insert(4, "Java")
    End Sub
End Class