as mentioned before password is secured
so, you want user writes it but others who stand near him/her can't see the password written .
And you can also [for more security ]make textbox forecolor property like page for color that makes password you are writing can't be seen
<asp:textbox id="passwordtext" runat="server" forecolor="White" textmode="Password" />
but u can access it from code easily
lable1.text=passwordtext.text;