private void CreateTilePath(int layerId, int zoomLevel, int row)
{
var subfolders = string.Format(@"{0}\{1}\{2}", layerId, zoomLevel, row);
var tileFolderPath = System.IO.Path.Combine(_vectorCacheRootDirectory, subfolders);
if (!Directory.Exists(tileFolderPath))
{
Directory.CreateDirectory(tileFolderPath);
}
}