System.Security.Cryptography.SHA256Managed.Initialize C# (CSharp) Method

        public override sealed void Initialize()
        {
            // Nothing to do here. We expect HashAlgorithm to invoke HashFinal() and Initialize() as a pair. This reflects the
            // reality that our native crypto providers (e.g. CNG) expose hash finalization and object reinitialization as an atomic operation.
            return;
        }

 public static byte[] SHA256(string str)
 {
     SHA256 sha = new SHA256Managed();
     sha.Initialize();
     //return sha.ComputeHash(str.ToByteArray());
     return sha.ComputeHash(Encoding.UTF8.GetBytes(str));
 }