private void pictureBox1_Click(object sender, EventArgs e)
 {
     PL.FRM_Control frmcon = new FRM_Control();
     frmcon.user_state = txt_doc_roll.Text;
     frmcon.Show();
     this.Hide();
 }
 private void panel4_Click(object sender, EventArgs e)
 {
     PL.FRM_Control frmcon = new FRM_Control();
     frmcon.Show();
     this.Hide();
 }