//implenting singelton pattern to this class
public static AddBookAttirbutes Instance(Type t)
{
if (instance == null)
{
instance = new AddBookAttirbutes(t);
}
instance.SetAsNewWindow(t);
return(instance);
}
/// <summary>
/// when the selected item in combox have id of -1 (the Agreed sign for this Action) the add new book attirbute window is open.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox comboBox = (ComboBox)sender;
BookAttributes elem = (BookAttributes)comboBox.SelectedValue;
Type t = elem.GetType();
if (elem.ID == -1)
{
Form form = AddBookAttirbutes.Instance(t);
form.ShowDialog();
setComboBoxes();
}
}
