using System;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public class Students

    {

        [Required]

        public string Branch { get; set; }

        [Required]

        public string Doc { get; set; }

        [Required]

        public string Description { get; set; }

        [Required]

        public string dni { get; set; }

        [Required]

        public string Name { get; set; }

        [Required]

        public string Gender { get; set; }

        [Required]

        public string Title { get; set; }

        [Required]

        public string email { get; set; }

        [Required]

        public string degree { get; set; }

        [Required]

        public string date { get; set; }

        [Required]

        public string number { get; set; }

    }

    public static void Main()

    {

        var input = "  {\r\n  \"number\": 2106887,\r\n  \"date\": \"09/10/2018\",\r\n  \"degree\":\"BE\",\r\n  \"Students\": [\r\n    {\r\n      \"Branch\": \"ABK015\",\r\n      \"Doc\": \"NCE\",\r\n      \"Description\": \"Testing\",\r\n      \"dni\": \"1016035232\",\r\n      \"Name\": \"ABCE\",\r\n      \"Gender\": \"M\",\r\n      \"Title\": \"Univercity\",\r\n      \"email\": \"abc@in.com\",\r\n    },\r\n    {\r\n      \"Branch\": \"ABK016\",\r\n      \"Doc\": \"NCE\",\r\n      \"Description\": \"Testing1\",\r\n      \"dni\": \"1016035233\",\r\n      \"Name\": \"ABCE\",\r\n      \"Gender\": \"M\",\r\n      \"Title\": \"Univercity\",\r\n      \"email\": \"abcd@in.com\",\r\n    }\r\n  ]\r\n}";

​

            var template = new {number = "", date = "", degree = "", Students = new Students[0]};

            var jsonObject = JsonConvert.DeserializeAnonymousType(input, template);

​

            var students = jsonObject.Students.Select(s =>

            {

                s.number = jsonObject.number;

                s.date = jsonObject.date;

                s.degree = jsonObject.degree;

                return s;

            }).ToArray();

​

            var result = new {Students = students};

            var newJson = JsonConvert.SerializeObject(result, Formatting.Indented);

            Console.WriteLine(newJson);

    }

}