public partial class Form1 : Form
    {
        List<Control> tab1Controls = new List<Control>();

        public Form1()
        {
            InitializeComponent();

            foreach (var item in this.tabControl1.TabPages[0].Controls)
            {
                tab1Controls.Add(item as Control);
            }
        }

        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (true) // 你的逻辑条件
            {
                this.tabControl1.SelectedTab.Controls.Clear();
                foreach (var item in tab1Controls)
                {
                    this.tabControl1.SelectedTab.Controls.Add(item);
                }
            }
        }
    }