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1. ///Get the sub-domain from the provided URL
2. /// </summary>
3. /// <param name="url">URL to retrieve sub-domain from</param>
4. /// <returns></returns>
5. public static string RetrieveSubDomain(Uri url)
6. {
7.     string subDomain = "";
8.     if (url.HostNameType == UriHostNameType.Dns && (!(url.HostNameType == UriHostNameType.Unknown)))
9.     {
10.         string host = url.Host;
11.         int length = host.Split('.').Length;
12.         if (length > 2)
13.         {
14.             int last = host.LastIndexOf(".");
15.             int idx = host.LastIndexOf(".", last - 1);
16.             subDomain = host.Substring(0, idx);
17.         }
18.     }
19.  
20.     return subDomain;
21. }
    
    
    

///Get the sub-domain from the provided URL
/// </summary>
/// <param name="url">URL to retrieve sub-domain from</param>
/// <returns></returns>
public static string RetrieveSubDomain(Uri url)
{
    string subDomain = "";
    if (url.HostNameType == UriHostNameType.Dns && (!(url.HostNameType == UriHostNameType.Unknown)))
    {
        string host = url.Host;
        int length = host.Split('.').Length;
        if (length > 2)
        {
            int last = host.LastIndexOf(".");
            int idx = host.LastIndexOf(".", last - 1);
            subDomain = host.Substring(0, idx);
        }
    }

    return subDomain;
}