Namespace for [DataContract]

Question

I can\'t find the namespace to use for [DataContract] and [DataMember] elements. According to what I\'ve found, it seems that adding the following

Answer 1

First, I add the references to my Model, then I use them in my code. There are two references you should add:

using System.ServiceModel;
using System.Runtime.Serialization;

then, this problem was solved in my program. I hope this answer can help you. Thanks.