Getting FQDN From IPAdress In .net?

C# - Change Server IPAdress And Perform A Redirection Automatically?

I have created an web based application through which the users can change the server (where the web application is hosted) IPAddress.The problem is that, once i have changed the IPAddress to a new IPAddress, Response.Redirect("MyHome.aspx") is not working any more. I have also tried to redirect the user to the newly updated address but even it doesn't do the trick. No page found message appears after some time.For example: The url while the web application runs in IIS is : http://192.168.0.65/WebDemo/Default.aspx after changing the IPAddress to 192.168.0.66 and redirecting it with the Response.Redirect() method the http://192.168.0.65 is not accessible.Any idea of achieving this task of changing IPAddress of the server and doing an automatic redirect to the newly assigned IPAddress,