>I did renaming a lot of times, and every time I required change source to fix all class and file names in the chain of linking ASPX and code files.
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>However, I would not like it always automated. I would like to have it just as additional option in menu, like "Rename and fix source code" or so. Sometimes it is needed to have some names different, for example, for case you want to have that page in some, named only by you, specific namespace.

Yes, more flexibility would be needed. The suggestion to "Rename and fix source code" would be great.