Advantages of modal PopUp over simple PopUP :
è More compatible, simple to create , flashy/pretty and jQueryUI-friendly.
è The modal content can be any hierarchy of controls and is displayed above a background that can have a custom style applied to it.
è You can absolutely position a modal popup by setting the X and Y properties. By default it is centered on the page, however if just X or Y is specified then it is centered vertically or horizontally.
è When the user is done interacting with the modal content, a click of an OK/Cancel control dismisses the modal content and optionally runs custom script.
è The custom script will typically be used to apply whatever changes were made while the modal mode was active.
Here I used modal popup for printing the selected data, for that I used two buttons, radio button list, and one lable for displaying message what are you going to do.
The classes I used for this popup are coming from common External CSS page.