Dereference of a possibly null reference.

Dereference of a possibly null reference.

'RijndaelManaged' is obsolete: 'The Rijndael and RijndaelManaged types are obsolete. Use Aes instead.' (https://aka.ms/dotnet-warnings/SYSLIB0022)

'Rfc2898DeriveBytes.Rfc2898DeriveBytes(byte[], byte[], int)' is obsolete: 'The default hash algorithm and iteration counts in Rfc2898DeriveBytes constructors are outdated and insecure.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)

'RijndaelManaged' is obsolete: 'The Rijndael and RijndaelManaged types are obsolete. Use Aes instead.' (https://aka.ms/dotnet-warnings/SYSLIB0022)

'Rfc2898DeriveBytes.Rfc2898DeriveBytes(byte[], byte[], int)' is obsolete: 'The default hash algorithm and iteration counts in Rfc2898DeriveBytes constructors are outdated and insecure.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)

Dereference of a possibly null reference.

Dereference of a possibly null reference.

'RijndaelManaged' is obsolete: 'The Rijndael and RijndaelManaged types are obsolete. Use Aes instead.' (https://aka.ms/dotnet-warnings/SYSLIB0022)