VS中，C#调试代码，找不到问题点

using System;

namespace a
{
    class Program
    {
        static void Main(string[] args)
        {
            ReferenceAndValue.Demonstrsition();
            Console.ReadLine();
        }
    }

    public class stamp
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
    
    public static class ReferenceAndValue
    {
        public static void Demonstrsition()
        {
            stamp Stamp_1 = new stamp { Name = "Premiere", Age = 25 };
            stamp Stamp_2 = new stamp { Name = "Again", Age = 47 };
            int age = Stamp_1.Age;
            Stamp_1.Age = 22;
            stamp Stamp_3 = Stamp_2;
            Stamp_2.Name = "Again Amend";
            Console.WriteLine("Stamp_1's age:{()}", Stamp_1.Age);
            Console.WriteLine("age's value:{()}", age);
            Console.WriteLine("Stamp_2's name:{()}", Stamp_2.Name);
            Console.WriteLine("Stamp_3's name:{()}", Stamp_3.Name);
        }
    }
}

报错：
引发的异常:“System.FormatException”(位于 System.Private.CoreLib.dll 中)
“System.FormatException”类型的未经处理的异常在 System.Private.CoreLib.dll 中发生
Input string was not in a correct format.引发的异常:“System.FormatException”(位于 System.Private.CoreLib.dll 中)
“System.FormatException”类型的未经处理的异常在 System.Private.CoreLib.dll 中发生
Input string was not in a correct format.

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            ReferenceAndValue.Demonstrsition();
            Console.ReadLine();
        }
    }

    public class stamp
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }

    public static class ReferenceAndValue
    {
        public static void Demonstrsition()
        {
            stamp Stamp_1 = new stamp { Name = "Premiere", Age = 25 };
            stamp Stamp_2 = new stamp { Name = "Again", Age = 47 };
            int age = Stamp_1.Age;
            Stamp_1.Age = 22;
            stamp Stamp_3 = Stamp_2;
            Stamp_2.Name = "Again Amend";
            Console.WriteLine($"Stamp_1's age:{Stamp_1.Age}");
            Console.WriteLine($"age's value:{age}");
            Console.WriteLine($"Stamp_2's name:{Stamp_2.Name}");
            Console.WriteLine($"Stamp_3's name:{Stamp_3.Name}");
        }
    }
}