I'm trying to do a web application in which the user creates a account in the /extranet domain and its disabled initially. When the sitecore admin enables the user account an function should be triggered so that a mail can be sent to the user, But i'm not finding any solution to trigger the code.
This is the code i have used to create the user in /extranet
Membership.CreateUser(mailId, password, mailId, "question", "answer", false, out status);
Please refer: http://techmusingz.wordpress.com/2014/06/15/notify-sitecore-user-on-account-enable/ for a complete example of overriding the corresponding command.
You will need to replace
<command name="usermanager:enable" type="Sitecore.Shell.Framework.Commands.UserManager.Enable,Sitecore.Kernel"/>
with <command name="usermanager:enable" type="Sitecore72.Classes.EnableUserNotify, Sitecore72"/>
You could use the reflected code from Sitecore.Kernel.dll, and append your logic for notification in the Run method - where args.IsPostBack is true, after the user profile has been updated (user.IsApproved = true;)
This would enable you to retain the message boxes as implemented by sitecore and add the custom functionality you need as well.