I have 3 asp.net pages in a project created later, now I have created a
Master Page so my question is how can I tell it to apply the new master
pages to existing pages  ?

Thanks

I had to manually do this.

Look at the top of the .aspx file.  You'll see the masterpage directive
up there.
Aka.
Look at an (already setup as master page) aspx page to find the
directive.

Then paste that manually into your existing page.


If somebody has a GUI way to do it, then please correct me.

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