how to use updatepanel

Question

i'm using updatepanel on DropDownList and trigger on CheckBox and another updatepanel on another DropDownList and trigger on the previous DropDownList so when i check the CheckBox the first DropDownList change without refreshing the page good but when i select new index from the first DropDownList after i checked the CheckBox the second DropDownList must change without refreshing the page but it won't change can anyone help ?

Sanjay Kumar · Answer

Hi try this http://stackoverflow.com/questions/1256943/dropdownlist-in-updatepanel http://asp-net-by-parijat.blogspot.in/2014/05/ajax-update-panel-with-drop-down-list.html http://www.aspforums.net/Threads/213448/How-to-refresh-ASPNet-UpdatePanel-on-DropDownList-change-in-ASPNet/ http://www.encodedna.com/2013/02/aspdotnet.postback-updatepanel.htm

jony anderson · Answer

thanx Sanjay Kumar for quick reply i figured the problem i wrote Response.Write(update); so you can't use Response.Write when you are using updatepanel so when i removed it it worked perfectly.