How to ASP.NET web application in iframe of another website?

See more:

ASP.NET

IFrame

I created my web application in asp.net when It is hosted on a domain (www.abc.com). but when I embed my web application (www.abc.com) in the iframe of another domain(www.abc123.com) then it lost the session. what I have to do so the session will not be lost or expire?

What I have tried:

In your golbal.asax.cs set X-Frame-Options to AllowAll:

 protected void Application_PreSendRequestHeaders()
 {
    Response.Headers.Remove("X-Frame-Options");
    Response.AddHeader("X-Frame-Options", "AllowAll");
 }

but it doesn't work. how can I allow others to iframe my website and also session will not lost their value .