/// <summary>
///This function is called when the update button is clicked on the form and passes the DTO object to the bussiness layer.
/// </summary>
private void bttn_update_Click(object sender, EventArgs e)
{
EmployeeBAL employeebalobj = new EmployeeBAL();
employeebalobj.update(add_to_DTOobj());
MessageBox.Show("updated successfully");
}