Retrieve value from a Dataview

good day, As this is my first .Net prj., pls excuse my ignorance. I need to fill a textbox according to the value the user clicks in a dropdownlist box. the dropdownlist box is filled via a dataview. asp.net & sql 2000

Ex.

dropdownlist : (user chooses)         'AUSTIN'

(then according to the City)
textbox1: 'TEXAS'

THE DATA SIDE
------------------
I have 2 tables called StateMaster & CityMaster
the StateMaster table has the fields                                               the CityMaster table has the fields
mst_StateCode   (char, 2)(PK)                                                      mst_StateCode   (char, 2)(FK)
mst_StateName  (varchar, 50)                                                      mst_CityCode (varchar, 10)(PK)
mst_StateStatus (char, 1)                                                            mst_CityName (varchar, 50)

THE FORM SIDE
------------------
ddlcity1
textbox1  

The plan basically is to fill in the textbox with the state name based on the selection in the ddlcity1 dropdownlist.

HERE IS THE CODE
----------------------

   Private dvProducts As DataView
    Private dvState As DataView
    Public strMsg As String
    Public strErrorMsg As String

    Protected Const SQL_CONNECTION_STRING As String = _
    "Server=SQLSERVER;Initial Catalog=database;UID=tempuser;password=tempuser"

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim scnnNW As New SqlConnection(SQL_CONNECTION_STRING)

        Dim strSQL As String = _
        "SELECT * FROM CityMaster WHERE mst_CityStatus=0 order by mst_CityCode"

        Dim scmd As New SqlCommand(strSQL, scnnNW)

        ' A SqlDataAdapter uses the SqlCommand object to fill a DataSet.
        Dim sda As New SqlDataAdapter(scmd)

        ' Create and Fill a new DataSet.
        Dim ds As New DataSet
        sda.Fill(ds)

        If Not IsNothing(Cache("dvProducts")) Then
            ' All items in the cache are of type Object, so you have to explicitly
            ' cast it before working with it further.
            dvProducts = CType(Cache("dvProducts"), DataView)
        Else ' DataView was not found in the cache.
            ' Create a new DataView.
            dvProducts = ds.Tables(0).DefaultView
            ' Put the new DataView into the Cache
            Cache("dvProducts") = dvProducts
        End If

        With ddlCity1
            .DataSource = dvProducts
            .DataValueField = "mst_StateCode"
            .DataTextField = "mst_CityName"
            .DataBind()
        End With
        ddlCity1.Items.Insert(0, New ListItem("--------Select One--------", "0"))


        strSQL = "SELECT * FROM StateMaster WHERE mst_StateStatus=0 order by mst_StateCode"
        Dim scmd1 As New SqlCommand(strSQL, scnnNW)
        Dim sda1 As New SqlDataAdapter(scmd1)

        ' Create and Fill a new DataSet.
        Dim ds1 As New DataSet
        sda1.Fill(ds1)
        If Not IsNothing(Cache("dvState")) Then
            dvState = CType(Cache("dvState"), DataView)
        Else
            dvState = ds.Tables(0).DefaultView
            Cache("dvState") = dvState
        End If

    End Sub


    Private Sub ddlCity1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlCity1.SelectedIndexChanged

        Dim i As Integer
        dvState.Sort = "mst_StateCode"
        TextBox1.Text = ddlCity1.SelectedItem.Value
        i = dvState.Find(ddlCity1.SelectedValue)
        TextBox1.Text = CStr(dvState.Item(i)("mst_StateName"))

    End Sub

but it dosent work. When i select a value in the dropdownlist, i get the value of the first item in the ddlcity1 - even though I've selected some other value.

Pls help.