using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

        {

            ""Rows"": {

                ""Row"": [

                    {

                        ""Rows"": {},

                        ""type"": ""Section"",

                        ""group"": ""Income"",

                        ""Summary"": {

                            ""ColData"": [

                                {

                                    ""value"": ""Total Income""

                                },

                                {

                                    ""value"": ""325.00""

                                }

                            ]

                        }

                    },

                    {}

                ]

            }

        }";

​

        var obj = JObject.Parse(json);

        var amount = (string)obj.SelectToken("Rows.Row[0].Summary.ColData[1].value");

        Console.WriteLine(amount);

    }

}