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;
                }