private void btnCalcSalary_Click(object sender, EventArgs e)
 {
     CalcSalary esa = new CalcSalary();
     esa.ShowDialog();
 }
        private void btnCalcSalary_Click(object sender, EventArgs e)
        {
            CalcSalary esa = new CalcSalary();

            esa.ShowDialog();
        }