public PromptForm()
{
InitializeComponent();
AutoSize = true;
FormClosing += delegate(object sender, FormClosingEventArgs args)
{
bool valid = true;
if (ValidateInput != null)
{
foreach (var d in ValidateInput.GetInvocationList())
{
valid = (bool)d.DynamicInvoke();
if (!valid)
{
break;
}
}
}
bool cancel = DialogResult != DialogResult.Cancel && !valid;
if (cancel)
{
args.Cancel = true;
SystemSounds.Beep.Play();
}
};
MinimumSize = new Size(400, 150);
}