Dropdown onchange

[eluser]umefarooq[/eluser]
you can populate textbox with ajax onchange event of dropdown send a request to server and get the values and populate the textbox if you are using jquery then your code will be like this if you are getting json data from server

Code:

$("#dropdown_id").change(function(){
   $.post('url',send_data,function(return_data){
     $("#textbox_1_id").val(return_data.textbox_1_value);
$("#textbox_2_id").val(return_data.textbox_2_value);
});
,'json'
})