Why LoginView cannot be added to PlaceHolder?

[Morgan Cheng]

I tried to add a LoginView control in OnClick eventhandler of a
button.
The code is like below

LoginView login = new LoginView();
PlaceHolder1.Controls.Add(login);

After run the page, I click the button and nothing happens.

If I change LoginView to a Label, it shows.
Why this happens? Should I set some properties to LoginView before add
it to PlaceHolder Control?

[bruce barker]

on postback your code has to remember it added on the LoginView on page
render. the LoginView needs to be re-add in the postback oninit.
otherwise there is no control to handle the postback data.

-- bruce (sqlwork.com)

Morgan Cheng wrote:

I tried to add a LoginView control in OnClick eventhandler of a
button.
The code is like below

LoginView login = new LoginView();
PlaceHolder1.Controls.Add(login);

After run the page, I click the button and nothing happens.

If I change LoginView to a Label, it shows.
Why this happens? Should I set some properties to LoginView before add
it to PlaceHolder Control?