a member with the name already exists on code example

Example: c# json serialization exception a memeber wi th name already exists

// Your object already has an JsonProperty with the same property name e.g.
class Obj {
 	[JsonProperty(PropertyName = "id")]
	Id { get; set; }
 	// [JsonProperty(PropertyName = "id")] // <- Change this
	[JsonProperty(PropertyName = "Obj2Id")] // <- This works because of an
  	// unique property name
	Obj2Id { get; set; }
}