AjaxControlToolkit.TabContainer.EnsureActiveTab C# (CSharp) Method

        void EnsureActiveTab()
        {
            if(_activeTabIndex < 0 || _activeTabIndex >= Tabs.Count)
                _activeTabIndex = 0;

            for(int i = 0; i < Tabs.Count; i++) {
                Tabs[i].Active = i == ActiveTabIndex;
            }
        }