Converting null literal or possible null value to non-nullable type.

Non-nullable field 'Server' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Non-nullable field 'machineCode' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

'BinaryFormatter.Deserialize(Stream)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' (https://aka.ms/dotnet-warnings/SYSLIB0011)

'BinaryFormatter.Serialize(Stream, object)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' (https://aka.ms/dotnet-warnings/SYSLIB0011)

Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.