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

We use:

public static string GetSubDomain()
        {
            string subDomain = String.Empty;

            if (HttpContext.Current.Request.Url.HostNameType == UriHostNameType.Dns)
            {
                subDomain = Regex.Replace(HttpContext.Current.Request.Url.Host, "((.*)(\\..*){2})|(.*)", "$2");
            }

            if (subDomain.Length == 0)
            {
                subDomain = "www";
            }

            return subDomain.Trim().ToLower();
        }