How can I change the time counter direction if to count up or down ?

Nedudale 141 Reputation points
2021-10-26T23:37:40.84+00:00
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 Extract  
{  
    public partial class TimeCounter : Label  
    {  
        private Timer _timer;  
        private int _elapsedSeconds;  
  
        public TimeCounter()  
        {  
            InitializeComponent();  
  
            _timer = new Timer  
            {  
                Interval = 1000,  
                Enabled = true  
            };  
            _timer.Tick += (sender, args) =>  
            {  
                _elapsedSeconds++;  
                TimeSpan time = TimeSpan.FromSeconds(_elapsedSeconds);  
                this.Text = time.ToString(@"hh\:mm\:ss");  
            };  
        }  
  
        private void TimeCounter_Load(object sender, EventArgs e)  
        {  
  
        }  
    }  
}  

I tried to change the line _elapsedSeconds++; to _elapsedSeconds--; but it's keep counting up. I want to be able to change the counter either to count down or up.

C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
6,967 questions
Windows Forms
Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
1,322 questions
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Accepted answer
  1. Karen Payne MVP 29,236 Reputation points Microsoft MVP
    2021-10-27T01:56:53.937+00:00

    In the following example, the Timer was dropped from the ToolBox.

    using System;
    using System.Windows.Forms;
    
    namespace TimerUpDown
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private bool _direction;
            private int _seconds;
            private int _highValue = 10;
            private int _lowValue = 0;
    
            private void button1_Click(object sender, EventArgs e)
            {
                timer1.Enabled = false;
                _direction = checkBox1.Checked;
                _seconds = _direction ? _lowValue : _highValue;
                timer1.Enabled = true;
            }
            private void timer1_Tick(object sender, EventArgs e)
            {
                if (_direction)
                {
                    _seconds++;
                }
                else
                {
                    _seconds--;
                }
    
                label1.Text = TimeSpan.FromSeconds(_seconds).ToString("mm\\:ss");
    
                if (_seconds == _lowValue || _seconds >= _highValue)
                {
                    timer1.Enabled = false;
                }
    
            }
        }
    }
    
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