# System.Security.Cryptography.X509Certificates

``` diff
 namespace System.Security.Cryptography.X509Certificates {
     public sealed class X509ChainPolicy {
+        public X509Certificate2Collection CustomTrustStore { get; }
+        public X509ChainTrustMode TrustMode { get; set; }
     }
+    public enum X509ChainTrustMode {
+        CustomRootTrust = 1,
+        System = 0,
+    }
 }
```