Fetch Value according to dropdownlist in asp.net

Question

In asp.net How to fetch value1,value2 in 2 textboxes according to dropdownlist selection from database without postback.(Autopostback=False)

 In Master Page

 

In asp.net i am unable to fetch records according to dropdownlist selection without postback the page or without refreshing the page.

So plz help me to find this solution using jquery,json

Plz dont use linq..

Plz help me to find this solution... 

 

i want those in textboxes (Server Controls) and in master page......

 

Please help me......................