Not:- Round-Trip means a complete cycle from client to the server.For example, the browser sends the form back to the server, including the fact that the button is clicked , the server processes the code that is attached to the button click event, creates a new page with the latest state of the page, and sends it back to the browser.
Gothrough the URL its use full.
Response.Redirect used for both .aspx and html pages whereas Server.Transfer can be used only for .aspx pages and it is specific to ASP and ASP.NET.
Response.Redirect can be used to redirect a user to an external websites.
Server.Transfer can be used only on sites running on the same server.