I have a problem in debugging customization code. please refer to this screenshot below :

I already try to add symbol using Debug > Options And Settings > Debugging > Symbols. Please refer to screenshot below :

And then I try to attach the process to debug my code. Please refer to screenshot below :

My problem is still the same like in the first screenshot.
may help to check if web.config has compilation debug set to true.
<system.web>
<compilation debug="true" ....
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