private void btnAdd_Click_1(object sender, EventArgs e)
{
Employee employee = new Employee();
employee.UserName = txtUserName.Text;
employee.Password = txtPassword.Text;
employee.firstName = txtFirstName.Text;
employee.lastName = txtFirstName.Text;
employee.IsAdmin = chkAdmin.Checked;
employee.DateOfBirth = dtpDateOfBirth.Value;
UserOperations bl = new UserOperations();
bl.AddEmployee(employee);
MessageBox.Show("Operation succesful");
}