private void AddStudent_Click(object sender, EventArgs e)
        {
            EmployeeAddOrUpdateView employee = new EmployeeAddOrUpdateView();

            employee.ShowDialog();
            Refresh();
        }
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            int id        = int.Parse(dgEmployee.SelectedCells[0].FormattedValue.ToString());
            var _employee = GloblMain.dbo.Employees.Find(id);

            if (_employee == null)
            {
                return;
            }
            else
            {
                EmployeeAddOrUpdateView employee = new EmployeeAddOrUpdateView(_employee);
                employee.ShowDialog();
                Refresh();
            }
        }