private static string CalculateHash()
{
var memoryStream = new MemoryStream();
foreach (var resourceName in _styleSheetResourceNames)
ManifestResourceHelper.WriteResourceToStream(memoryStream, typeof(StyleSheetHelper), resourceName);
return MD5.Create()
.ComputeHash(memoryStream)
.Select(b => b.ToString("x2"))
.ToDelimitedString(string.Empty);
}
}