private void btnAdd_Click(object sender, EventArgs e)
        {
            TabPage Page = new TabPage();
            Page.Name = "Page" + index.ToString();
            Page.Text = "tabPage" + index.ToString();
            Page.TabIndex = index;
            this.tabControl1.Controls.Add(Page);

            #region 三种设置某个选项卡为当前选项卡的方法
            //this.tabControl1.SelectedIndex = index;
            this.tabControl1.SelectedTab = Page;
            //this.tabControl1.SelectTab("Page" + index.ToString());
            #endregion 

            index++;
        }


#region 两种删除某个选项卡的方法
                this.tabControl1.Controls.RemoveAt(this.tabControl1.SelectedIndex);
                //this.tabControl1.Controls.Remove(this.tabControl1.TabPages[this.tabControl1.TabPages.Count-1]);
                #endregion