Its not urgent for us..anyways try this..
<asp:dropdownlist id="DropDownList1" runat="server" onselectedindexchanged="DropDownList1_SelectedIndexChanged" xmlns:asp="#unknown">
</asp:dropdownlist>
<asp:textbox id="TextBox1" runat="server"></asp:textbox>
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = DropDownList1.SelectedValue.Trim();
}
Thanks
Ashish