How to put your site into maintainance mode

Uri uri = new Uri("http://www.google.co.uk/index.html");
if(uri.Host.ToLower().EndsWith("google.co.uk"))
{
//Do something
response.redirect("www.newsite.com/maintainance.html");
}

I am Dinesh kumar Choudhary by Name, a software Designer and Developer by Work, a Indian Hindu by Religion, Co-Founder of DSFoundation located at http://dsfoundation.wordpress.com by profession, a Loving husband and a Caring Father by Relation.

I have a blog Website at http://dennosecqtinstien.wordpress.com. DSFoundation is the Autonomous body to serve for the management of Local shops located at New Delhi, India. Now a days DSFoundation and its subsidiaries are managed by Erls Corporation, an Another initiative by me and my colleagues, in which i am the another CO-Founder of the Organization. Erls Corporation can be located at http:erlsindia.co.in