What is the difference between Server.Transfer and response.Redirect?

The difference  between the Server.Transfer and the response.Redirect them are as follows:-

1)Response.Redirect send a  message to the browser saying it to move to some other  page, while server.transfer does not send any message to the browser but rather redirects  user directly from the server itself. So in the server.transfer there is no round trip while in the  response.redirect there is a round trip and hence puts a load on the server.

2) In the Using Server.Transfer you can't redirect to a different from the server itself. For e.g. if your server is www.yahoo.com you can use server.transfer to move to www.microsoft.com but you can yes move to www.yahoo.com/travels, i.e. within websites. This cross server redirect is only possible using Response.redirect.

3) With the server.transfer you can preserve your all  information. It has a parameter known as "preserveForm". So the existing query string  will be able to  call a  page. In response.redirect you can maintain the state, but has lots  of demerits.