asp.net - DropDownList - Retrieving Data from Database - Disappear After AutoPostBack -

asp.net - DropDownList - Retrieving Data from Database - Disappear After AutoPostBack -

my dropdownlist1 retrieves info column in database, on same page, have dropdownlist2 when selecting value, fire autopostback, problem running is,

if select value dropdownlist1, value un-selected when autopostback happens, how can create dropdownlist keeps selected value when autopostback fired?

thank you

you must binding dropdownlist1 in page_load event. in case, should create sure should bind first time , not every time using ispostback property below, otherwise every time info db , re-populate dropdownlist.

protected void page_load(object sender, eventargs e) { if(!ispostback) { //bind dropdownlist1 } }

asp.net .net drop-down-menu