private void 更新履歴ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     timer1.Enabled = false;
     Form4 form4 = new Form4();
     form4.ShowDialog();
     timer1.Enabled = true;
 }
 private void button5_Click(object sender, EventArgs e)
 {
     timer1.Enabled = false;
     Form4 form4 = new Form4();
     form4.ShowDialog();
     timer1.Enabled = true;
 }