Public Class Form1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        If ListBox1.Items.Contains(TextBox1.Text) Then
            MsgBox("Schon vorhanden!!")
        ElseIf ListBox1.Items.Add(TextBox1.Text) Then
        End If
        TextBox1.Text = ""
        TextBox1.Focus()
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button2.Click
        Try
            ListBox1.Items.Remove(ListBox1.SelectedItem)
            ListBox1.SelectedIndex = 0
        Catch ex As Exception
 
        End Try
 
    End Sub
    Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As _
      System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        If MsgBox("Save changes?", MsgBoxStyle.YesNo) = MsgBoxResult.Yes Then
            For Each item As String In ListBox1.Items
                My.Settings.strings.Add(item.ToString)
                My.Settings.Save()
            Next
        End If
    End Sub
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        Try
            For Each item As String In My.Settings.strings
                ListBox1.Items.Add(item)
            Next
        Catch ex As Exception
 
        End Try
    End Sub
End Class