C# Example to get SubDomain From URL

C# utility function to find sub domain name from URL. Make Uri object from string url and call below method.

Example

public static string GetSubDomain(Uri url)
{
if (url.HostNameType == UriHostNameType.Dns)
{
var host = url.Host;
if (host.Split(\'.\').Length > 2)
{
var lastIndex = host.LastIndexOf(".");
var index = host.LastIndexOf(".", lastIndex - 1);
return host.Substring(0, index);
}
}
return null;
}

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