VS 2010 [RESOLVED] Building a Where Clause with AND/OR

'Adding the filters to DDL
    Protected Sub btnAddFilter_Click(sender As Object, e As System.EventArgs) Handles btnAddFilter.Click
        lbFilters.Items.Add(ddlSearch.Text & " = '" & txtFor.Text & "'")
    End Sub
'Building them to where clause
    Public Function buildSearch() As String
        For i = 0 To lbFilters.Items.Count - 1
            filterString = filterString + lbFilters.Items(i).ToString + " AND "
        Next
        Return filterString
    End Function
'Creating query string and filtering
     Public Sub Search()
        Dim searchString As String = "SELECT Control_Number, Status, OrderNumber, State, County, Address, Date_Received, Priority, Client_Name From orders, client WHERE "
        Dim listString As String = "SELECT Control_Number From orders WHERE "
        searchString = searchString + buildSearch()
        listString = listString + buildSearch()
        Session("SelectCommand") = searchString & "orders.Client = client.ClientID ORDER BY Control_Number"
        SqlDataSourceDelete.SelectCommand = Session("SelectCommand")
        Session("OrderList") = Left(listString, listString.Length - 5)
    End Sub