Can you talk about what you mean by a white sign? What content will be changed and what will it depend on?
In your Web.config file, find
<system.web> <authentication mode="Forms"> <forms loginUrl="/Login/Index" /> </authentication>
Change the loginUrl attribute as you want. Then, in the login action, select the correct view to return.
You will need a certain type of identifier in order to distinguish clients (subdomain, cookie or something else). Use this to choose the right type for return.
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