Duplicate values on dropdownlist

Hi,

I am having the follwing code;

Code:

---

Try

            Dim PeerValue As New System.Data.SqlClient.SqlCommand(("Select PeerRvw From dbo.TblChangeControlDet WHERE ChangeID=@ChangeID"), conn)
            PeerValue.Parameters.AddWithValue("@ChangeID", txtchangeID.Text)

            Using Autoreader As System.Data.SqlClient.SqlDataReader = PeerValue.ExecuteReader()

                While Autoreader.Read()
                    Dim PeerRvw As String = Autoreader.GetValue(0)

                    cmbpeername1.SelectedItem.Text = PeerRvw

                End While
            End Using

        Catch ex As Exception
            MsgBox(ex.Message, MsgBoxStyle.Information, "CCMS")
        End Try

---

Works fine, however, when I click the dropdownlist the combobox (cmbperrname1) I have duplicate values for the selecteditem.

E.g.,

Combobox has 3 values

A
B
C

Results when you select the dropdownlist;

B - Selecteditem
A
B
C


Thanks