How to do Basecamp-style accounts in Asp.Net Mvc?

Question

For an Asp.Net software as a service application, I want to do account based subdomains like Basecamp and the rest of the 37Signals products have. E.g. acme.myapp.com will load

Answer 1

It's not very different compared to RoR. Just get the HTTP-Request, take the Host-Value, split it (at each dot) and take the first part to get the subdomain.

string subdomain = requestContext.HttpContext.
                      Request.Headers["Host"].Split('.')[0];

Then just resolve the subdomain to the Companies account.