added orai, TODO: stopwatch

20240311/WindowsFormsApp1/Form1.cs

@@ -0,0 +1,55 @@
+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 WindowsFormsApp1
+{
+    public partial class Form1 : Form
+    {
+        DateTime start = new DateTime();
+        DateTime stop = new DateTime();
+        TimeSpan duration = new TimeSpan();
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+            
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            start = DateTime.Now;
+            timer1.Enabled = true;
+            button1.Enabled = false;
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            stop = DateTime.Now;
+            duration = stop - start;
+            label1.Text = duration.ToString();
+
+            timer1.Enabled = false;
+            button1.Enabled = true;
+        }
+
+        private void label1_Click(object sender, EventArgs e)
+        {
+
+        }
+
+        private void textBox1_TextChanged(object sender, EventArgs e)
+        {
+            textBox1.Text = DateTime.Now.ToString("HH:mm:ss:fff");
+        }
+    }
+}