*Solved* How To Insert String Every Few Characters In Text

[NinjaNic]

Hello!
I need to know how to insert a dash, for example, every 3 characters in string. (Then show it in a text box.) This is what I have right now but it doesn't do anything. What is wrong with this code?
Thanks!
~NinjaNic

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim YourText As String = TextBox1.Text
        For i As Int32 = YourText.Length To 0 Step -3
            YourText.Insert(i, "-")
        Next
        TextBox1.Text = YourText
    End Sub