Validate a file path using C#

I finally found a good algorithm to validate a file path (had to fix two bugs in it though). I use this static method in Windows Forms when the user is allowed to enter a path. I add a text changed event on the textbox and call this method to enable or disable an OK button.

public static bool ValidateFilepath(string path)
{
   if (path.Trim() == string.Empty)
   {
      return false;
   }

   string pathname;
   string filename;
   try
   {
      pathname = Path.GetPathRoot(path);
      filename = Path.GetFileName(path);
   }
   catch (ArgumentException)
   {
      // GetPathRoot() and GetFileName() above will throw exceptions
      // if pathname/filename could not be parsed.

      return false;
   }

   // Make sure the filename part was actually specified
   if (filename.Trim() == string.Empty)
   {
      return false;
   }

   // Not sure if additional checking below is needed, but no harm done
   if (pathname.IndexOfAny(Path.GetInvalidPathChars()) >= 0)
   {
      return false;
   }

   if (filename.IndexOfAny(Path.GetInvalidFileNameChars()) >= 0)
   {
      return false;
   }
   
   return true;
}