Replace hostname in URL using C#

Below is a function that replaces the hostname in a URL in C#. I take 2 arguments, the old and new host then returns the new host that can be pinged and browsed:

 
public static string ReplaceHost(string originalHost, string newHost)
        {
            UriBuilder _builder = new UriBuilder(originalHost);
            _builder.Host = new Uri(newHost).Host;
            return _builder.ToString();
        }

Now call the function from the main method:

        static void Main(string[] args)
        {
            string NewHost = ReplaceHost("http://tutorialspanel.com", "http://www.tutorialspanel.com");
            Console.WriteLine(NewHost);
            Console.ReadKey();
        }

Output

http://www.tutorialspanel.com:80/

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