dynamic - How to load user controls dynamically in ASP.NET without postback -

i have asp.net(c#) page. when user selects value in dropdownlist, new controls visible him.

i able now, page has reload every time , state has maintained between postbacks.

is there way same without reloading of page in easiest way possible without using ajax control toolkit?

additional info: data dropdownlist coming database, , places has server side can't use javascript .

you can try idea: http://msdn.microsoft.com/en-us/library/ms178208(v=vs.100).aspx. have not try before seems logical.