Asp.net Mvc 3 ViewContext To New Object Then Changing The TempViewContext.RouteData Modifies The Original ViewContext?

i have worked on a culture switch control and i need to modify the ViewContext.RouteData("culture") to check if the view exists anyway when i do the following

Dim routeData As RouteData = ViewContext.RouteData
routeData.Values.Remove("culture")
routeData.Values.Add("culture", cultureValue)

then the original ViewContext.RouteData is changed when i change the routeData.I have tested to do the following to but no success

Dim tempViewContext As New ViewContext(ViewContext.Controller.ControllerContext, ViewContext.View, ViewContext.ViewData, ViewContext.TempData, ViewContext.Writer)
Dim routeData As RouteData = tempViewContext.RouteData
routeData.Values.Remove("culture")
routeData.Values.Add("culture", cultureValue)

how to copy the ViewContext to a temporary object and changing the values without changing the original ViewContext values?

Edit: The only way i know work is to change the routeData then check if it exists and after it change the routeData back to the original culture... was hopping there were a another way but it works for know.