Build .NET applications with the DevExpress Spreadsheet Document API for creating, reading, modifying, and exporting Excel workbooks programmatically without Microsoft Office. Use when working with .xlsx, .xls, .xlsm, .csv spreadsheet files, cell formatting, formulas, charts, pivot tables, data import/export, or workbook printing. Also use when someone mentions "DevExpress Spreadsheet", "Spreadsheet Document API", "IWorkbook", "Worksheet", "DevExpress.Spreadsheet", "create Excel file in C#", "read xlsx in .NET", "spreadsheet export to PDF", "cell formatting", or asks about any Excel/spreadsheet automation with DevExpress. Covers both .NET and .NET Framework.
Expert skill for the DevExpress WinForms AccordionControl (DevExpress.XtraBars.Navigation.AccordionControl, DevExpress.Win.Navigation NuGet). Covers creating and populating accordion menus, data-driven element generation from collections, AccordionControlElement groups and items, content containers with embedded controls, header layout customization via HeaderTemplate, view types (Default accordion vs HamburgerMenu), Hamburger Menu display modes (Inline/Overlay/Minimal), minimize/expand state, Footer root-element mode, built-in and external search/filter panel, AI Smart Search, expand/collapse behavior, animations, appearance and HTML-CSS templates, context buttons, custom drawing, and guidance on choosing between AccordionControl, NavBarControl, and Hamburger Menu style. Use this skill when a user asks about WinForms side navigation, accordion menus, hamburger menus, collapsible navigation bars, AccordionControlElement configuration, NavigationFrame integration, or FluentDesignForm navigation setup.
AI agent skill for the DevExpress WinForms AIChatControl. Covers NuGet setup, the project SDK change, AI client registration (OpenAI, Azure OpenAI, Ollama), adding the control to a form, streaming, Markdown rendering, manual message handling (MessageSending), and chat history (SaveMessages/LoadMessages). Use for any DevExpress WinForms AIChatControl scenario.
DevExpress WinForms Chart Control (DevExpress.XtraCharts.ChartControl) for 2D and 3D data visualization. Covers the element hierarchy (ChartControl, Diagram, Series, SeriesView); data binding (DataSource, SeriesDataMember, ArgumentDataMember, ValueDataMembers, SeriesTemplate, FinancialDataMembers, RefreshData); the series-view catalog and parent diagrams (XYDiagram hosts Bar/Line/Area/Point/Bubble/Financial/BoxPlot; SimpleDiagram hosts Pie/Doughnut/Funnel; Radar, Polar, Gantt, SwiftPlot, 3D); axes (AxisX/AxisY, SecondaryAxes, scale types Numerical/DateTime/Qualitative, ranges, aggregation); titles and labels (TextPattern, CustomAxisLabel); legends (Legend/Legends, alignment, markers); tooltips vs the crosshair cursor (ToolTipController, CrosshairOptions); and selection (SelectionMode, SeriesSelectionMode, ObjectSelected). Use for any WinForms charting scenario including financial/stock charts and real-time updates.
DevExpress WinForms Data Grid — GridControl with GridView, BandedGridView, AdvBandedGridView, CardView, LayoutView, TileView, and WinExplorerView, plus the TreeList for hierarchical data. Covers data binding (regular, ServerMode, InstantFeedback, VirtualServerModeSource), column generation (PopulateColumns, AddVisible, unbound columns via UnboundExpression, bands, ColumnEdit), cell display and editing (RepositoryItem, CustomRowCellEdit, DisplayFormat, edit forms, OptionsColumn), conditional formatting (FormatRules), validation (ValidateRow, SetColumnError), filtering (Excel-style, Auto Filter Row, Find Panel, ActiveFilterString), sorting and grouping (SortInfo, GroupInterval), master-detail (LevelTree, pattern views), print and export (ExportToXlsx/Pdf), focus and selection (FocusedRow, MultiSelect), drag-and-drop, and layout persistence (SaveLayoutToXml). Use for any WinForms grid, tree-list, or card-view scenario.
DevExpress WinForms Editors suite — every editor under DevExpress.XtraEditors: the BaseEdit hierarchy (TextEdit, ButtonEdit, MemoEdit, ComboBoxEdit, ImageComboBoxEdit, CheckedComboBoxEdit, LookUpEdit, GridLookUpEdit, SearchLookUpEdit, TreeListLookUpEdit, SpinEdit, DateEdit, TimeEdit, TimeSpanEdit, CalcEdit, ColorEdit, ColorPickEdit, CheckEdit, ToggleSwitch, PictureEdit, ProgressBarControl, RadioGroup, RatingControl, TokenEdit, TrackBarControl) plus non-BaseEdit controls (LabelControl, SimpleButton, DropDownButton, ListBoxControl, CheckedListBoxControl). Covers EditValue binding, the RepositoryItem and live-editor pattern, input masks (DateTime, Numeric, RegEx, Simple, TimeSpan, MaskSettings.Configure, EditMask attributes, UseMaskAsDisplayFormat), and editor buttons (EditorButton, ButtonPredefines, Properties.Buttons, ButtonClick, SVG/raster glyphs, TextEditStyle). Use for any standalone WinForms editor, value formatting, mask validation, or ButtonEdit customization.
DevExpress WinForms Layout Management — form layout and docking controls: LayoutControl (free/flow/table layout modes, groups, tabbed groups, size constraints, runtime customization), DataLayoutControl (data-source-driven auto-generated editor layout, RetrieveFields, DataAnnotations), DockManager with DockPanel (VS-style docking, floating panels, auto-hide, tab groups, DockingStyle, DockAsTab), StackPanel, and TablePanel (Absolute/AutoSize/Relative sizing, RowSpan/ColumnSpan). Covers NuGet (DevExpress.Win.Navigation, DevExpress.Utils), namespaces (DevExpress.XtraLayout, DevExpress.XtraDataLayout, DevExpress.XtraBars.Docking, DevExpress.Utils.Layout), authoring layouts in the *.Designer.cs file (InitializeComponent), building layouts in code (AddItem, AddGroup, AddTabbedGroup), and saving/restoring layouts (SaveLayoutToXml/Json, WorkspaceManager). Use for any WinForms layout, form arrangement, or docking scenario; for a form generated from a table/class use DataLayoutControl.
DevExpress WinForms Loading Indicators — SplashScreenManager (namespace DevExpress.XtraSplashScreen) is the single entry point. Covers four types: (1) Splash Screen for app startup — Fluent (ShowFluentSplashScreen with FluentSplashScreenOptions, FluentLoadingIndicatorType Dots/Ring/Spinner), Skin, Default, and Splash Image, shown before Application.Run() and closed via CloseForm(); (2) Wait Form — a modal full-form overlay for long operations (ShowWaitForm, SetWaitFormCaption/Description, SendCommand, CloseWaitForm); (3) Overlay Form — a semi-transparent overlay over a control (ShowOverlayForm returning IOverlaySplashScreenHandle, CloseOverlayForm in try/finally, custom painting); (4) ProgressPanel — an inline control with Caption, Description, WaitAnimationType Ring/Line/Bar. NuGet DevExpress.Win.Navigation; host on XtraForm/RibbonForm. Use for splash screens, wait indicators, busy overlays, and progress panels.