SPSite site = new SPSite(SPContext.Current.Web.Url) vs SPContext.Current.Web.Site

Question

Why do some SharePoint examples use

using (SPSite site = new SPSite(SPContext.Current.Web.Url))
{
    ...
}

and not just simply?

Answer 1

It depends on the context in which your code runs. For instance, you need to create a new SPSite instance if you are running within a RunWithElevatedPrivileges block.