private void simpleButton2_Click(object sender, EventArgs e)
 {
     GetPromotionDetails(txtEmployeeID.Text);
     frmPromotion promotion = new frmPromotion(Promotion,this);
     promotion.ShowDialog();
 }
 private void simpleButton4_Click(object sender, EventArgs e)
 {
     frmPromotion promotion = new frmPromotion(txtEmployeeID.Text);
     promotion.ShowDialog();
 }