求大佬指教，C#方面Convert.ToInt32(txtHour.Text)中的txtHour.Text一直显示对象引用非静态的字符....


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace _4_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        class Time
        {
            private int hour;
            private int minute;
            private int second;
            public Time()
            {
                hour = System.DateTime.Now.Hour;
                minute = System.DateTime.Now.Minute;
                second = System.DateTime.Now.Second;
            }
            public Time(int h, int m, int s)
            {
                hour = h; minute = m; second = s;
            }
            public void AddSecond()
            {
                second++;
                if (second >= 60)
                {
                    second = second % 60;
                    minute++;
                }
                if (minute >= 60)
                {
                    minute = minute % 60;
                    hour++;
                }
            }
            public int Hour
            {
                get => hour;
            }
            public int Minute
            {
                get => minute;
            }
            public int Second
            {
                get => second;
            }
            private void button1_Click(object sender, EventArgs e)
            {
                Time time=new Time(Convert .ToInt32 (txtHour.Text),Convert.ToInt32 (txtMinute.Text ),Convert .ToInt32(txtSecond.Text ) ;
                time.AddSecond();
                txtHour.Text = Convert.ToString(time.Hour);
                txtMinute.Text = Convert.ToString(time.Minute);
                txtSecond.Text = Convert.ToString(time.Second);
            }
        }      
        private void Form1_Load_1(object sender, EventArgs e)
        {
            Time t1 = new Time();
            txtHour.Text = Convert.ToString(t1.Hour);
            txtMinute.Text = Convert.ToString(t1.Minute);
            txtSecond.Text = Convert.ToString(t1.Second);
        }
    }
}