Finding a textbox inside InsertItemTemplate in Listview

I have tried this but it does not work:

Dim txt As TextBox = CType(lv2.Items(lv2.SelectedIndex) _
    .FindControl("txtCode"), TextBox)

What is the solution plea开发者_JAVA百科se?

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Dim txtCode As TextBox = _
      CType(lv2.InsertItem.FindControl("txtCode"), TextBox)