The absolute path representation of the specified virtual path.
An application absolute path is one where the application path is used instead of the root operator (the tilde [~]).
If virtualPath is:
Absolute, the VirtualPathUtility.ToAbsolute(string) method returns the virtual path unchanged.
Application relative, the VirtualPathUtility.ToAbsolute(string) method appends the current application virtual directory path to the beginning of the virtualPath. For example, the current application virtual directory path can be accessed from the HttpRuntime.AppDomainAppVirtualPath property.
Not rooted, the VirtualPathUtility.ToAbsolute(string) method raises an ArgumentOutOfRangeException exception.