how to make customers subscribed with forum posts ?

I want all the customers who are posting on the forum to get subscribed by default with the forum post that they are posting.

By default this checkbox below should be checked 'Notify me via email when someone posts in this topic"

I have tried making the checkbox true like this:

<asp:CheckBox ID="cbSubscribe" runat="server" Text="<% $NopResources:Forum.NotifyWhenSomeonePostsInThisTopic %>"  CssClass="forumtopicoptionscheck" Checked="true" />

but i think i am facing same problem like this: https://www.nopcommerce.com/boards/t/6816/how-to-make-notify-me-when-someone-posts-in-this-topic-to-true-for-all-users-.aspx


This question was never answered, anyone ? plz help