private void BTN_SAVE_Click(object sender, EventArgs e)
 {
     if (TXT_SUPPLIER_NAME.Text.Length == 0)
     {
         TXT_SUPPLIER_NAME.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Warning(), "PLEASE ENTER SUPPLIER NAME", MessageAlertImage.Warning());
         mdg.ShowDialog();
     }
     else if (BTN_SAVE.Text == "SAVE")
     {
         SAVE_SUPPLIER();
         LOAD_SUPPLIER_lIST();
         BTN_SAVE.Text = "SAVE";
         BTN_NEW.Focus();
         clearAll();
     }
     else if (BTN_SAVE.Text == "UPDATE")
     {
         UPDATE_SUPPLIERS_DATA();
         LOAD_SUPPLIER_lIST();
         BTN_NEW.Focus();
         BTN_SAVE.Text = "SAVE";
         clearAll();
     }
 }
 private void BTN_NEW_Click(object sender, EventArgs e)
 {
     clearAll();
     TXT_SUPPLIER_NAME.Focus();
     BTN_SAVE.Text = "SAVE";
 }
 private void SUPPLIER_Load(object sender, EventArgs e)
 {
     LOAD_SUPPLIER_lIST();
     TXT_SUPPLIER_NAME.Focus();
 }