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Use the AsnEncodedDataCollection class

using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; class MainClass {     static void Main()     {                     X509Store store = new X509Store("MY", StoreLocation.CurrentUser);             store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);             X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;             X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);             X509Certificate2Collection scollection = X509Certificate2UI.SelectFromCollection(fcollection, "Certificate Select", "Select certificates from the following list to get extension information on that certificate", X509SelectionFlag.MultiSelection);             AsnEncodedDataCollection asncoll = new AsnEncodedDataCollection();             for (int i = 0; i < scollection.Count; i++)             {                 Console.WriteLine( scollection[i].GetName());                 foreach (X509Extension extension in scollection[i].Extensions)                 {                     AsnEncodedData asndata = new AsnEncodedData(extension.Oid, extension.RawData);                     Console.WriteLine(extension.Oid.FriendlyName);                     Console.WriteLine(asndata.Oid.Value);                     Console.WriteLine(asndata.RawData.Length);                     Console.WriteLine(asndata.Format(true));                     asncoll.Add(asndata);                 }             }             Console.WriteLine(asncoll.Count);             store.Close();             AsnEncodedDataEnumerator asne = asncoll.GetEnumerator();             asne.MoveNext();             Console.WriteLine(asne.Current.Format(true));             asne.MoveNext();             Console.WriteLine(asne.Current.Format(true));             asne.Reset();     } }