namespace System
{
    public class Exception : ISerializable
    {
        [Obsolete("BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.", DiagnosticId = "SYSLIB0011", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
        protected event EventHandler<SafeSerializationEventArgs!>? SerializeObjectState;
    }
}