// Create a new SerializationInfo object SerializationInfo info = new SerializationInfo(typeof(Person), new FormatterConverter()); // Add a UInt64 value to the SerializationInfo info.AddValue("ID", UInt64.MaxValue, typeof(UInt64)); // Retrieve the UInt64 value from the SerializationInfo UInt64 id = info.GetUInt64("ID");In this example, we first create a new SerializationInfo object and add a UInt64 value to it with the name "ID". We then use the GetUInt64() method to retrieve this value with the same name. The System.Runtime.Serialization namespace is used for serializing and deserializing data in .NET applications.