private void toolStripButton8_Click_1(object sender, EventArgs e)
{
MessageBox.Show("ออกจากระบบเรียบร้อย");
toolStripButton1.Visible = false;
toolStripButton2.Visible = false;
toolStripButton3.Visible = false;
toolStripButton4.Visible = false;
toolStripButton5.Visible = false;
toolStripButton6.Visible = false;
toolStripButton7.Visible = true;
toolStripButton8.Visible = false;
toolStripButton9.Visible = false;
toolStripButton10.Visible = false;
toolStripButton11.Visible = false;
label1.Show();
label2.Show();
textBox1.Show();
textBox2.Show();
button1.Show();
CloseAllChildForm();
toolStripButton2.Checked = true;
frm_login next = new frm_login();
next.MdiParent = this;
next.Show();
}
public frm_Main()
{
InitializeComponent();
this.WindowState = FormWindowState.Maximized;
toolStripButton1.Visible = false;
toolStripButton2.Visible = false;
toolStripButton3.Visible = false;
toolStripButton4.Visible = false;
toolStripButton5.Visible = false;
toolStripButton6.Visible = false;
toolStripButton7.Visible = true;
toolStripButton8.Visible = false;
toolStripButton9.Visible = false;
toolStripButton10.Visible = false;
toolStripButton11.Visible = false;
CloseAllChildForm();
frm_login next = new frm_login();
next.MdiParent = this;
next.Show();
}