The field 'MyButton._buttonState' is assigned but its value is never used

'Encoding.UTF7' is obsolete: 'The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.' (https://aka.ms/dotnet-warnings/SYSLIB0001)

'WebClient.WebClient()' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

The field 'MyButton._buttonState' is assigned but its value is never used

'Encoding.UTF7' is obsolete: 'The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.' (https://aka.ms/dotnet-warnings/SYSLIB0001)

'WebClient.WebClient()' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)