求有关在vb2005下的多控件操作问题（关于控件数组）！！！！！

'定义部分
Dim i As Integer
Dim a(50) As TextBox
For i = 0 To 49
a(i) = New TextBox()
a(i).Size = TextBox5.Size
a(i).Top = 100
a(i).Left = i * 150 + 150 * Rnd()
Me.Controls.Add(a(i))
Next i
‘赋值部分
for i = 0 to 29
a(i).text = "0"
next i