When you’ve got some existing ASP.NET pages and you later on want to add a common masterpage, do this:

Master Page

1. Create a masterpage, e.g. Management.Master.
2. Add the sub pages’ comon controls to the master.
3. In the Management.Master, add ContentPlaceHolder items for head and body:

Sub Page

Do the following in the subpage.aspx:

1. Add masterpagefile to page level directive:
   <%@ Page ... MasterPageFile="Management.Master"
2. Remove the , ,

   and

   , tags.

3. Replace the tag by the tag respecting the link to the ContentPlaceHolder via ID and ContentPlaceHolderID, like this:

    // former head content goes here

4. Likewise replace the body tag by the tag:

    // former body content goes here

Sub Page Easy

If you've got nothing than the