The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

'Rfc2898DeriveBytes.Rfc2898DeriveBytes(string, byte[], int)' is obsolete: 'The default hash algorithm and iteration counts in Rfc2898DeriveBytes constructors are outdated and insecure. Use a constructor that accepts the hash algorithm and the number of iterations.' (https://aka.ms/dotnet-warnings/SYSLIB0041)

'MD5CryptoServiceProvider' is obsolete: 'Derived cryptographic types are obsolete. Use the Create method on the base type instead.' (https://aka.ms/dotnet-warnings/SYSLIB0021)

'DESCryptoServiceProvider' is obsolete: 'Derived cryptographic types are obsolete. Use the Create method on the base type instead.' (https://aka.ms/dotnet-warnings/SYSLIB0021)

'ApplicationException.ApplicationException(SerializationInfo, StreamingContext)' is obsolete: 'This API supports obsolete formatter-based serialization. It should not be called or extended by application code.' (https://aka.ms/dotnet-warnings/SYSLIB0051)

#warning: '"Insecure! Rewrite with custom parser https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide"'

#warning: '"Insecure! Rewrite with custom parser https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide"'

#warning: '"Insecure! Rewrite with custom parser https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide"'

#warning: '"Insecure! Rewrite with custom parser https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide"'