I find the solution...actually i make fool to Browser...like
<input type="text" name="username" style="display:none" value="fake input>
<asp:textbox id="TxtUser" runat="server" value="Username>
<input type="text" name="username" style="display:none" value="fake input>
<asp:textbox id="TxtPwd" runat="server" autocomplete="off" value="Password</asp:textbox>;
This works for me