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 -->")