Exercise 1: this exercise creates a SharePoint web part that adds security to the Staff and Student site collections. To do that, the code creates a new permission level (Staff permissions) for the Staff site collection. Finally, any newly created group in SharePoint programatically inherits permissions granted by the Staff Permissions level.
Exercise 2: The above web part was enhanced by additional functionality: the program can now add or replace user A for user B in any group where use A existed.
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