What is the use of place holder and can we use it as an pop up window

instead of placeholder you can think of panel control or much lighter html control div...

all you need is a little javascript and you are done..

in google you can search for hiding panels/div..

hope it helps.

PlaceHolder control serves as container to add controls dynamically to a web page at run time. The PlaceHolder control does not produce any visible output and is used only as a container for other controls on the Web page.

Therefore you cannot use it to show popup window.

You can use DIV to show a popup using CSS layers and javascript.

Try the following links.

How to Popup a Window Using DIV Layer in ASP.NET 1.x/2.x

DIV Popups

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