"Right click> View Source"" in webbrowser in the Opener page (i.e. the page in which btnUpdFromPopUp) is added. search for "btnUpdFromPopUp" it should locate you to the input control generated for this button check the ID property of the button is it exactly "btnUpdFromPopUp" or "parentOfbutton_btnUpdFromPopUp".
Asp.net appends parentIDs to their child controlIDs in order to make them unique and your code probably fails because you trying to find partial ID and that doesn't exists.
one workaround could be:
1- write a javascript function in your Opener page like below:
function RefreshMe()
{
document.getElementById('<%= btnUpdFromPopUp.ClientID %>').click();
}
2- and modify the child window like this:
function RefreshParent()
{
window.opener.RefreshMe();
window.close();
}
Hope it will help you.
thanks,
Hemant