Here is my code
static void Main(string[] args) { try { ContentInfo contentInfo = new ContentInfo(File.ReadAllBytes(@\"D:\\prj\\t
Try loading the Certificates from The Windows Certificate store,
Below link will provide you a detailed tutorial for Signing of Passes in .net
http://geekswithblogs.net/MobileLOB/archive/2012/07/30/part-3ndashpassbook-server.aspx
Hope this helps.. :)