Using AJAX CalendarExtender inside ModalPopupExtender Modal Popup in ASP.Net

how to get modal popup value in current webpage from modal popup access.

i have a webpage containing a link to open modal popup

in that web page i there is a label where i want to get the value from modal popup. 

suppose in modal popup i have text box and button when i worte any thing in that text box and submitting that text by popup button then entered text will be appear on the label of webpage.

give me reference so i do such kind of operations.