主题：[求助]将数据输出至多行文本框中

Dim str() As String = {"1","2","3","4","5","6"}
Dim ls As new List(Of String)
For i As Integer = 1 To 200
    For j As Integer = 1 To 5 '洗牌次数   ----这个代码主要起到什么作用的呢?
        Dim rnum1 As Integer = Rand.Next(str.Length)
        Dim rnum2 As Integer = Rand.Next(str.Length)
        Dim temp As String = str(rnum1)
        str(rnum1) = str(rnum2)
        str(rnum2) = temp
    Next
    Dim data As String = String.Join("", str)
    If ls.Contains(data) = False Then
        ls.add(data)
    Else
        i -=1
    End If
Next

e.form.Conrols("TextBox1").Text = String.Join(vbcrlf, ls.ToArray)