System.Security.Cryptography.X509Certificates.X509CertificateCollection.this C# (CSharp) Method

        public X509Certificate this[int index]
        {
            get
            {
                return ((X509Certificate)(List[index]));
            }
            set
            {
                if (value == null)
                    throw new ArgumentNullException(nameof(value));

                List[index] = value;
            }
        }