Breakpoints are not hit when debugging, Outlook Add in

I spend to resolve this issue for half of my working day but I could not find out the solution. I am using Visual Studio 2013 and have around 10 projects in one solution. one of them is Outlook Addin.

The Outlook refer to Debug Directory ( PROJECT_NAME/bin/Debug/AddinOutlook2013.vsto|vstoocal)

It success to show up a simple dialog ( OK ) when a button in Addin in Outlook was clicked. But when i put the break point that code, it is never hit.

PROBLEM

Breakpoints are not hit when debugging in Outlook Add in project.

What I DID were :

Tried to this link https://www.add-in-express.com/docs/net-deploying-debugging-tips.php
Run the both window application and outlook after re-installed the add in.
Enable 'Define DEBUG constant' and disable 'Optimize code'
Set the 'Startexternal program' to the outlook application '.exe' path.

How can i hit the breakpoint ?

Thank you for any help and advice.

Solution

Resolved !!!!

Thank you for many helps. Finally i have done it !!

How did I fix

Set the Startup Project to Addin Project. Then Close Outlook and then Run as Debug for the Solution.

Thank you for many helps!

I love you!