the software contains one functional master page which has many ASPX file under these master page and i want to add another main Master Page above the existing one , does any one help me how to do ? when i try to add Masterpage by selecting Previous Masterpage and run , it generate error related to the content place holders.
the software contains one functional master page which has many ASPX file under these
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They are called “nested master pages”, here is an official walkthrough, but you can google the term for a tons more like it: http://msdn.microsoft.com/en-us/library/bb547109.aspx