أعتقد أنك تريده بهذه الطريقة
كود :
Dim i, x As Byte
Dim Cont As Integer = ListBox1.Items.Count - 1
Dim M As Integer
For c As Integer = 0 To Cont
If i + x = 10 Then
TextBox1.Text = ListBox1.Items(c - M)
ListBox1.Items.RemoveAt(c - M)
M += 1
Threading.Thread.Sleep(6000)
i = 0
End If
i += 1
Next