Multi-Tenant-Asp.net mvc3-sub domains-dynamic--without make an entry in hosts file

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ASP.NET

MVC3

I have an Asp.net MVC3 application I want to be able to allow multiple/ different clients to access the same application but using different url's. I have already managed to configure the database to allow this. So hia's the main part i want to host my application in a domain say... wwww.myapplication.com then allow different client to access the same application using 1.www.clientOne.myapplication.com 2.www.clientTwo.myapplication.com.

process flow--
->register button
->user signup
->redirect to username.myapp.com

if user directly enters "username.myapp.com" in the address bar it should automatically ask login info..

.any one please help me..