DropDownList SelectedIndex and DataTable Problem

 Hello Everyone,
I have a DropDownList bound to a sqlDataSource, and a TextBox that is to receive a value from a DataSet upon the DropDownList Selection.  Each time the first selection of the DropDownList is selected the value of the DataSet second row(1) is passed to the TextBox instead of passing the value of the first row (0).  See Code Below.
 
--- ASPX PAGE---

<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
                                        DataTextField="Office"
                              &nbs ...