private void RefreshForm()
{
pass_label1.Refresh();
fname_textBox1.Refresh();
Mname_textBox2.Refresh();
lname_textBox3.Refresh();
age_textBox1.Refresh();
}
/// <summary>
/// This function clears all the boxes and labels to be able to add a new passenger information
/// </summary>
private void clearBoxes()
{
fname_textBox1.Clear();
Mname_textBox2.Clear();
lname_textBox3.Clear();
age_textBox1.Clear();
gender_comboBox2.SelectedIndex = -1;
birthDateCalender.Value = System.DateTime.Now;
}