<asp:textbox id="txtpassword" textmode="password" runat="server" xmlns:asp="#unknown">
<asp:textbox id="txtrepassword" textmode="password" runat="server" xmlns:asp="#unknown">
<asp:CompareValidator ID="cvp"runat="server" ControlToCompare="txtrepassword"ControlToValidate="txtpassword"
Display="dynamic" ErrorMessage="*" ForeColor="red" ValidationGroup="reg"ValueToCompare="txtpassword"></asp:CompareValidator>