How to create an Instance of a class ??

Question

In VS2005 webapplications how can we create an instance of a class in a page (Eg :deafult3.aspx) from another page (deafult2.aspx).In the earliar VS2003 we could create an instace of a page

Eg for page . Webapplication2.aspx

Webapplication2 objpage=new Webapplication2();

but here in VS2005 we can't create like this.

OR

How can we Import a page from another page in VS 2005 ,c#.

how it s possible ???

Hope u respond sooon.

thanks
Arunlal