How do I dynamically hide/unhide tabs in a TabControl?

You can dynamically remove and inseret TabPages into the TabControl.TabPages collection to hide and show tabs at runtime.

        TabPage tabPageSave = null;
        private void button1_Click(object sender, EventArgs e)
        {
            //hide a tab by removing it from the TabPages collection
            this.tabPageSave = tabControl1.SelectedTab;
            this.tabControl1.TabPages.Remove(this.tabPageSave);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //show a tab by adding it to the TabPages collection
            if (this.tabPageSave != null)
            {
                int loc = tabControl1.SelectedIndex;
                this.tabControl1.TabPages.Insert(loc, this.tabPageSave);
            }
        }