private void Form1_Load(object sender, EventArgs e)
 {
     rb_pereche1.Visible = rb_pereche2.Visible = false;
     saveFileHelper      = SaveFileHelper.getInstance();
     excelHelper         = ExcelHelper.getInstance();
     vacanteHelper       = VacanteHelper.getInstance();
 }
 public static SaveFileHelper getInstance()
 {
     if (instance == null)
     {
         instance = new SaveFileHelper();
     }
     return(instance);
 }