System.Security.Cryptography.X509Certificates.X509Chain.Reset C# (CSharp) Method

        public void Reset()
        {
            // _chainPolicy is not reset for desktop compat
            _lazyChainStatus = null;
            _chainElements = null;
            _useMachineContext = false;

            IChainPal pal = _pal;
            _pal = null;
            if (pal != null)
                pal.Dispose();
        }

        /// <summary>
        /// Find the issuer certificate.
        /// First checks if the leaf certificate's Subject and Issuer fields are not the same.
        /// Otherwise, the certificate is the issuer (self-signed certificate)
        /// If different it instatniates a X509Chain object and passes leaf certificate to X509Chain.Build method.Examine ChainElements property (a collection) and element at index 1 is the issuer.
        /// </summary>
        /// <param name="leafCert"></param>
        /// <returns></returns>
        public static X509Certificate2 GetIssuer(X509Certificate2 leafCert)
        {
            if (leafCert.Subject == leafCert.Issuer)
            {
                return(leafCert);
            }
            var chain = new X509Chain();

            chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
            chain.Build(leafCert);
            X509Certificate2 issuer = null;

            if (chain.ChainElements.Count > 1)
            {
                issuer = chain.ChainElements[1].Certificate;
            }
            chain.Reset();
            return(issuer);
        }