System.Windows.Forms.TabControl.IndexForTabPage C# (CSharp) Method

		internal int IndexForTabPage (TabPage page)
		{
			for (int i = 0; i < tab_pages.Count; i++) {
				if (page == tab_pages [i])
					return i;
			}
			return -1;
		}

            public override void Remove(Control value)
            {
                bool change_index = false;

                TabPage page = value as TabPage;

                if (page != null && owner.Controls.Contains(page))
                {
                    int index = owner.IndexForTabPage(page);
                    if (index < owner.SelectedIndex || owner.SelectedIndex == Count - 1)
                    {
                        change_index = true;
                    }
                }
                base.Remove(value);
                owner.m_helper.Remove(page);
                // We don't want to raise SelectedIndexChanged until after we
                // have removed from the collection, so TabCount will be
                // correct for the user.
                if (change_index && Count > 0)
                {
                    // Clear the selected index internally, to avoid trying to access the previous
                    // selected tab when setting the new one - this is what .net seems to do
                    int prev_selected_index = owner.SelectedIndex;
                    owner.selected_index = -1;

                    owner.SelectedIndex = --prev_selected_index;
                    owner.Invalidate();
                }
                else if (change_index)
                {
                    owner.selected_index = -1;
                    owner.OnSelectedIndexChanged(EventArgs.Empty);
                    owner.Invalidate();
                }
                else
                {
                    owner.Redraw();
                }
            }