using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.Xml.Serialization;

using System.Runtime.Serialization;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;        

​

    // dotnetfiddle does not support data contract attributes, so I had to comment them out.

​

    //[DataContract]

    public class Update_DB

    {

        //[DataMember(Name = "appname", IsRequired = true)]

        public string appname { get; set; }

        //[DataMember]

        public string key { get; set; }

​

        //[DataMember(Name = "data", IsRequired = true)]

        public List<Dictionary<string, string>> data { get; set; }

​

        //[DataMember]

        public string updateId { get; set; }

        //[DataMember]

        public string updateTS { get; set; }

        //[DataMember]

        public string creationUser { get; set; }

    }

​

    class TestClass

    {

​

        internal static void Test()

        {

            var collection = new Update_DB

            {

                data = new List<Dictionary<string, string>>

                {

                    new Dictionary<string, string>

                    {

                        {"data1", "10551296"},

                        {"data2", "TrainingIns"},

                        {"data3", "Completed"},

                    },

                    new Dictionary<string, string>

                    {

                        {"connectorType", "webserver-to-appserver"},

                        {"sourceUri", "data4"},

                        {"destinationUri", "data5"},

                    },

                },

            };

            string x = JsonConvert.SerializeObject(collection.data, Formatting.Indented);

            Console.WriteLine(x);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            TestClass.Test();

        }

    }

​