dropdownlists not ispostback values

Hi,
I have 3 dropdownlists.  I "save" the values in session variables so that the values are retained when user navigates to other views (I'm using multiview control).  However, when user returns to the view containing the dropdownlists, all 3 dropdownlists contain the value of the last dropdownlist.  Below are the code snippets: <table>   <tr><td><asp:DropDownList ID="Practice1Desc" runat="server" AutoPostback="True" OnSelectedIndexChanged="Practice1Desc_SelectedIndexChanged"></td></tr>   <tr><td><asp:DropDownList ID="Practice2Desc" runat="server" AutoPostback="True" OnSelectedIndexChanged="Practice2Desc_SelectedIndexChanged"></td></tr>   <tr><td><asp:DropDownList ID="Practice3Desc" runat="server" AutoPostback="True" ...