ListItem和DropDownList绑定数据

 遇到问题，控件ListItem和DropDownList绑定数据库数据后selectedindex数
> 值始终为-1,导致无法选定索引号。
>  考虑解决办法：不直接绑定，数据库数据连接到ArrayList后再用控件的
> Items.Add方法添加内容
Dim myConn As SqlConnection = New SqlConnection("Server=localhost;" & _
                                                            "Database=Pubs;UID=sa;PWD=")
            Dim myCmd As SqlCommand = New SqlCommand("SELECT au_id," & _
                                                     "au_lname FROM Authors", myConn)


            myConn.Open()
            Dim myReader As SqlDataReader = myCmd.ExecuteReader()

            'Set up the data binding.
            AuthorList.DataSource = myReader
            AuthorList.DataTextField = "au_lname"
            AuthorList.DataValueField = "au_id"
            AuthorList.DataBind()

            'Close the connection.
            myConn.Close()
            myReader.Close()

            'Add the item at the first position.
            AuthorList.Items.Insert(0, "<-- Select -->")

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