my difficulty dealing with Listbox in VB.net

[happyworld]

I am new to VB.net.
I want to display information in some textboxes correspondent to selected item in the listbox. Therefore I have a Sub SelectedIndexChanged as follows:

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
oraconn.ConnectionString = "data source= &db ;uid= &user; pwd = &psd ; unicode=yes"
Dim str2 As String
Try
str2 = "select MA_DVIDCHINH, TEN_DVIDCHINH from ddvi_dchinh" & _
"where ma_DVIDCHINH = '" & _
Me.ListBox1.SelectedValue & "'"
If oraconn.State = ConnectionState.Closed Then
oraconn.Open()
End If
With oracmd
.CommandType = CommandType.Text
.CommandText = str2
.Connection = oraconn
End With
Catch ex As Exception
MsgBox(ex.ToString)
End Try
Dim dr As DataRow
Dim dt As New DataTable
If ds.Tables("IT").Rows.Count > 0 Then
For Each dr In ds.Tables("IT").Rows
Me.TextBox1.Text = dr.Item("TEN_DVIDCHINH")
Me.TextBox3.Text = dr.Item("MA_DVIDCHINH")
Next

End If
Me.TextBox1.Text = sender.text
End Sub
However, in return a runtime error caused by str2 as Me.ListBox1.SelectedValue & is datarowview

How can I do in this case. And do you have any other solutions to bind a listbox with some textboxes.

Thanks in advance.

[kenobewan]

What exactly was the error? Afraid your naming conventions leave a little to be desired :(.

[happyworld]

The exception was:"Cast from type 'datarowview' to 'String' is not valid"
That is because Me.ListBox1.SelectedValue does not return a string value.

In my Form_load sub I assigned: Me.ListBox1.DisplayMember = "TEN_DVIDCHINH"
Me.ListBox1.ValueMember = "MA_DVIDCHINH"

So I desire to get data based on the selected valuemember.