I binded the Ajax popupcontrolextender with one textbox.
whenever i click on text box the popup is displaying.
Issue is when i click on textbox its displaying popup below the textbox . at the same time if i scrolling my page the popup is also moving up-down.
Can some please help on this
You could use Ajax Control Toolkit ModalPopup control, and set the property RepositionMode="RepositionOnWindowResizeAndScroll" .
Please refer the link for specific information: