Copy/Insert Value to textbox from selected dropdownlist

my system allow user to select value from a dropdownlist and then copy/insert to the textbox. already had the following code in aspx.vb:   Protected Sub ddl_indv_reason_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl_indv_reason.SelectedIndexChanged tb_ot_reason.Text = ddl_indv_reason.SelectedValue End Sub   part of the code in aspx:     <table style="width:100%;"> <tr> <td valign="top" > <asp:Label ID="lb_ot_reason" runat="server" Text="Reason for undertaking overtime work" meta:resourcekey="lb_ot_reason"></asp:Label> </td> < ...