ASP.NET Dialog Window
Designed to replicate the functionality of a standard Windows Forms dialog box, the ASP.NET AJAX dialog window control allows you to popup both modal and non-modal dialogs in-browser that show all common dialog behaviors.
Modal or Modeless
The WebDialogWindow allows you to set whether the dialog behaves as a modal or modeless (non-modal) dialog would allowing you to better control the flow of your application.
The WebDialogWindow displays a customizable header area into which you can place caption text, several buttons including such stand-by's as the close, minimize and maximize buttons seen in desktop applications.
Just like a resizable dialog on the desktop, you can enable your end user to resize the WebDialogWindow at run-time.
WebDialogWindow persists whether the user has minimized, restored or maximized its appearance.