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If I register user control in ASP.NET page, the control will be loaded to the page or not?
<%@ Register Src=".." TagName="tag" TagPrefix="pre" %>
even if I not call it in the page using?
<pre:tag id='control123' />
because part of my code is executed even if I’m not calling the control, I found that when I did performance profilling.
In this case your user control will be loaded to the page object in server side, that mean it will be processed with whole lifecycle of ASP.NET app, but because you don’t create control instance non output html will be rendered. You are using ‘type’ but not the ‘instance’.
Answering you question: yes, it will be loaded, but not rendered, databounded, etc…
Edited 2/7/2012
If you want to get rid of the Register Directive, you always could use web.config – follow instructions of this Scottgu post.