vb ListBox 控件如何对文本操作

在listbox中有各种选项，我希望通过点击下面的按钮来实现添加颜色和删除颜色，同时还要保存到文件，我是新手，希望有朋友能够帮助我一下，非常感谢！！

Private Sub AddColor_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddColor.Click
Using sw As StreamWriter = New StreamWriter("color.txt")
ListBox1.Items.Add(TextBox2.Text)
For i = 0 To ListBox1.Items.Count - 1
sw.WriteLine(ListBox1.Items.Item(i))
Next
sw.Close()
End Using
End Sub

Private Sub ReadColor_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ReadColor.Click
Using sr As StreamReader = New StreamReader("color.txt")
Dim line As String
While Not sr.EndOfStream
line = sr.ReadLine()
ListBox1.Items.Add(line)
End While
sr.Close()
End Using
End Sub

listbox.Additem text1.text