Display Cascading DropDownList inside ModalPopupExtender and send selected value to another page using C# and VB.Net in ASP.Net

hi every one   i have used this link with some modifications

http://www.c-sharpcorner.com/UploadFile/cd7c2e/creating-model-popup-in-Asp-Net-application-by-using-ajax/ i have two pages (webform1,webform2 ) in webform1 i have button to show a popup(ModalPopupExtender,panel in webform2) i mean webform2 has ModalPopupExtender,panel,5 cascading dropdownlists to filter data in ModalPopupExtender and display result of filtering in label this is I did it well my need is how to transfere data in label into webform1 and display it in a label in webform1 i hope you got my idea any help will be appreciated