using System;

using Newtonsoft.Json;  

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        ParseValid();

        ParseEmpty();

​

    }

    public static void ParseValid()

    {

        try

        {

            JObject obj = JObject.Parse(@"

                {

                    ""type"": ""Backend.BusinessRule.Exception"",

                    ""title"": ""Unprocessable Entity"",

                    ""status"": 422,

                    ""detail"": "" OPERATOR NOT AUTHORIZED FOR THIS TXN  TRANSACTION DUMP GENERATED IN MECH "",

                    ""instance"": ""/payment-initiation/mutual-fund-purchase-instruction/match-maker"",

                    ""additionalDetails"": [   {

                           ""detailCode"": ""MECH.00051"",

                          ""detailMessage"": "" OPERATOR NOT AUTHORIZED FOR THIS TXN  TRANSACTION DUMP GENERATED IN MECH "",

                          ""sourceAppCatId"": ""112""

                        }]

                    }

                ");

            if (obj.ContainsKey("instance"))

            {

                Console.WriteLine("Contains Instance");

            }

            else

            {

                Console.WriteLine("Does not contain Instance");

            }

        }

        catch (Newtonsoft.Json.JsonReaderException ex)

        {

            Console.WriteLine("Invalid Json");

        }

    }

    public static void ParseEmpty()

    {

        try

        {

            var jsonStr = "";

            JObject obj = JObject.Parse(jsonStr);

            if (obj.ContainsKey("instance"))

            {

                Console.WriteLine("Contains Instance");

            }

            else

            {

                Console.WriteLine("Does not contain Instance");

            }

        }

        catch (Newtonsoft.Json.JsonReaderException ex)

        {

            Console.WriteLine("Invalid Json");

        }

    }

}