//Method that sets the ProductID of the size, shown in the runtime button, as an argument of the SizeClickedEventArgs and calls OnSizeClicked.
private void rtButtons_Click(object sender, EventArgs e)
{
productInfo.ProductId = Int32.Parse(((Button)sender).Name);
SizeClickedEventArgs args = new SizeClickedEventArgs(productInfo);
OnSizeClicked(args);
}
public virtual void OnSizeClicked(SizeClickedEventArgs e)
{
SizeClicked?.Invoke(this, e);
}