private void materialFlatButton2_Click(object sender, EventArgs e)
        {
            frmequipmentdiagnosis equipdiagnose = new frmequipmentdiagnosis();

            equipdiagnose.Show();
            this.Hide();
        }
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            this.Close();
            frmequipmentdiagnosis equipdiagnosis = new frmequipmentdiagnosis();

            equipdiagnosis.Show();
        }