TabPage判断重复添加Page

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...........代码如下：

  bool isPag = true;
                 foreach (TabPage page in tbpDynamicMenu.TabPages)
                 {
                     if (nodeName.Equals(page.Text))
                     {
                         tbpDynamicMenu.SelectedTab = page;
                         isPag = false;
                         break;
                     }
                 }
                 if (isPag)
                 {
                     //添加选卡
                     TabPage tbp = new TabPage();
                     tbp.Text = nodeName;
                     tbpDynamicMenu.Controls.Add(tbp);
                     tbpDynamicMenu.SelectedTab = tbp;
                 }