BrightIdeasSoftware.ObjectListView.MakeColumnCommandMenu C# (CSharp) Method

        public virtual ToolStripDropDown MakeColumnCommandMenu(ToolStripDropDown strip, int columnIndex)
        {
            OLVColumn column = this.GetColumn(columnIndex);
            if (column == null)
                return strip;

            if (strip.Items.Count > 0)
                strip.Items.Add(new ToolStripSeparator());

            string label = String.Format(this.MenuLabelSortAscending, column.Text);
            if (column.Sortable && !String.IsNullOrEmpty(label)) {
                strip.Items.Add(label, ObjectListView.SortAscendingImage, (EventHandler)delegate(object sender, EventArgs args) {
                    this.Sort(column, SortOrder.Ascending);
                });
            }
            label = String.Format(this.MenuLabelSortDescending, column.Text);
            if (column.Sortable && !String.IsNullOrEmpty(label)) {
                strip.Items.Add(label, ObjectListView.SortDescendingImage, (EventHandler)delegate(object sender, EventArgs args) {
                    this.Sort(column, SortOrder.Descending);
                });
            }
            if (this.CanShowGroups) {
                label = String.Format(this.MenuLabelGroupBy, column.Text);
                if (column.Groupable && !String.IsNullOrEmpty(label)) {
                    strip.Items.Add(label, null, (EventHandler)delegate(object sender, EventArgs args) {
                        this.ShowGroups = true;
                        this.PrimarySortColumn = column;
                        this.PrimarySortOrder = SortOrder.Ascending;
                        this.BuildList();
                    });
                }
            }
            if (this.ShowGroups) {
                if (this.AlwaysGroupByColumn == column) {
                    label = String.Format(this.MenuLabelUnlockGroupingOn, column.Text);
                    if (!String.IsNullOrEmpty(label)) {
                        strip.Items.Add(label, null, (EventHandler)delegate(object sender, EventArgs args) {
                            this.AlwaysGroupByColumn = null;
                            this.AlwaysGroupBySortOrder = SortOrder.Ascending;
                            this.BuildList();
                        });
                    }
                } else {
                    label = String.Format(this.MenuLabelLockGroupingOn, column.Text);
                    if (column.Groupable && !String.IsNullOrEmpty(label)) {
                        strip.Items.Add(label, null, (EventHandler)delegate(object sender, EventArgs args) {
                            this.ShowGroups = true;
                            this.AlwaysGroupByColumn = column;
                            this.AlwaysGroupBySortOrder = SortOrder.Ascending;
                            this.BuildList();
                        });
                    }
                }
                label = String.Format(this.MenuLabelTurnOffGroups, column.Text);
                if (!String.IsNullOrEmpty(label)) {
                    strip.Items.Add(label, null, (EventHandler)delegate(object sender, EventArgs args) {
                        this.ShowGroups = false;
                        this.BuildList();
                    });
                }
            } else {
                label = String.Format(this.MenuLabelUnsort, column.Text);
                if (column.Sortable && !String.IsNullOrEmpty(label) && this.PrimarySortOrder != SortOrder.None) {
                    strip.Items.Add(label, null, (EventHandler)delegate(object sender, EventArgs args) {
                        this.Unsort();
                    });
                }
            }

            return strip;
        }