using System;

using Newtonsoft.Json;

public class Program

{

    const string s = "{\"amount\":10,\"Amount\":9}";

    public class Tx

    {

        public decimal Amount { get; set; }

    }

    public static void Main()

    {

        var t = JsonConvert.DeserializeObject<Tx>(s);

        Console.WriteLine(t.Amount);

    }

}