Sunny,

If you modify the html presentation of an asp.net Label control, you need to
communicate the change to the server. You can use an <input type = "hidden">
for this. On server side you get the value from the hidden input and set the
label.

What does it have to do with differentiation between a refresh or regular
postback in code behind? It's another question. Browser refresh button
always repeats the last postback. On server side you can tell the difference
if you include a unique piece of data in the postback, for example a
timestamp. On the server you compare the timestamp that just came with the
one from the previous postback. If it's the same, it must be a refresh and
not an another postback.

Eliyahu