I have a Razor Macro which fetches data from a separate table (not Umbraco) and displays content inside a Umbraco template, now since this is a macro the page title and meta have already been set by the Umbraco content page, how do i set the page title and meta tags via the macro code?

tried setting ViewBag.Title in macro code but returns this error "The name 'Viewbag' does not exist in the current context"