asp.net - jquery: select and unselect items of listbox -

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I have 2 listboxes in the ASP.Net page (select in HTML) I want to know when one item of list 1 If selected, then the selected item in list 2 has not been deselected, and the Vice President

2 selections are exclusive to each other.

How can I do this? 

  $ (function () {var list1 = $ ("# listbox1"); var List2 = $ ("# listbox2"); list1.change (function () {$ ("option", list2) .attr ('selected', false);}); list2.change (function () {$ (" Option ", list1) .attr ('selected', false);});});

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