using System;
using System.Drawing;
using System.Threading.Tasks;
using System.Threading;
using System.Windows.Forms;
 
namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
           InitializeComponent();
        }
 
        private async void button1_Click(object sender, EventArgs e)
        {
            this.button1.Enabled = false; // ボタンを無効にする
            this.label1.Text = "実行中";
            this.timer1.Start();
 
            // 重い処理は別タスクで非同期実行
            await Task.Run(() =>
            {
               // ちょっと時間のかかる処理
               Thread.Sleep(10000);
            });
 
            this.timer1.Stop();
 
            this.label1.Text = string.Empty;
            this.label1.BackColor = SystemColors.Control;    // ラベルの背景色を元に戻す
            this.button1.Enabled = true; // ボタンを有効に戻す
        }
 
        private void timer1_Tick(object sender, EventArgs e)
        {
            // ラベルの背景色を切り替える
            this.label1.BackColor = this.label1.BackColor == SystemColors.Control ? Color.Red : SystemColors.Control;
        }
    }
}
 

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