the relative virtual path is not allowed here

When I try to display the html file HostingEnvironment.MapPath I got the error. There was a problem with my code and got 

an exception message as,

An exception of type 'System.ArgumentException' occurred in System.Web.dll but was not handled in user code

Additional information: The relative virtual path '../Data/page.html' is not allowed here.

Solution:

Instead of passing the path '../Data/page.html' we should use path like this,

System.Web.Hosting.HostingEnvironment.MapPath("~/Data/" + md)