protected override void MultiPrint()
{
base.MultiPrint();
MultiPrintFrm multiPrintFrm1 = new MultiPrintFrm();
multiPrintFrm1.Show();
}
/// <summary>
/// 弹出集中打印窗口，使用using(){}格式，默认实现Dispose，手动释放资源
/// </summary>
protected override void MultiPrint()
{
base.MultiPrint();
using (MultiPrintFrm multiPrintFrm = new MultiPrintFrm())
{
multiPrintFrm.ShowDialog();
}
}