Hi there, i have on my ASP.NET Webform a Button when i on it click i open with jquery ui a Dialog.
always when i click on the button i got a postback an the whole page reloads.
Also when i Close the Dialog i got also a postback.

first how can i prevent this ?

second i have on the mainpage a dropdownlist where i can select values. on the new popup Dialog i have a second dropdownlist where i can also select values. this selected value should be insert into dropdownlist one on the mainpage.

best regards thomas