How do I use the TextMode='Password' property?

I have my password in a string variable and I want to set that to a Textbox (). But the password doesn't get displayed there. What should I do to display it? When I change the textmode property to "singleline," it's displayed, so my variable has the data. I want to use the TextMode="Password" property.
As a security precaution, the password-mode textbox never renders a password (i.e. sends its content to the client). Even a login form won't contain the password after postback if login failed. This is good practice, and by design.

This was first published in June 2003