RadGrid for ASP.NET
Table of Contents
  • At a glance
  • Installation and deployment
  • DNN
  • Licensing
  • Already using the control
  • Functional overview
  • ASP.NET 2.0 Features
  • Getting Started
  • Grid columns
  • Grid rows
  • Defining Structure
  • Visible/Enabled conventions
  • Populating the control with data
  • AJAX
  • Sorting
  • Paging
  • Scrolling
  • Grouping
  • Filtering
  • Selecting grid items
  • Insert/Update/Delete records
  • Hierarchical grid types and Load modes
  • Design-time support
  • Controlling visual appearance
  • Localization/Accessibility
  • RadGrid export
  • The control lifecycle
  • Performance tips and tricks
  • Getting familiar with server-side API
  • Getting familiar with client-side API
  • Telerik RadGrid inheritance
  • How-to
  • Troubleshooting
  • Integration with other controls
  • Client-side API Reference
  • API Reference
    • Telerik.RadGridUtils Namespace
    • Telerik.WebControls Namespace
      • GridBaseDataList Class
      • GridBoolColumnEditor Class
      • GridBoundColumn Class
      • GridButtonColumn Class
      • GridCheckBoxColumn Class
      • GridCheckBoxColumnEditor Class
      • GridClientDeleteColumn Class
      • GridClientEvents Class
      • GridClientMessages Class
      • GridClientSelectColumn Class
      • GridClientSettings Class
      • GridColumn Class
      • GridColumnCollection Class
      • GridColumnCreatedEventArgs Class
      • GridColumnCreatingEventArgs Class
      • GridColumnEditorBase Class
      • GridColumnEditorException Class
      • GridColumnsReorderEventArgs Class
      • GridCommandEventArgs Class
      • GridCommandItem Class
      • GridCommandItemSettings Class
      • GridCreateColumnEditorEventArgs Class
      • GridDataChangeEventArgs Class
      • GridDataInsertItem Class
      • GridDataItem Class
      • GridDataItemCollection Class
      • GridDataKeyArray Class
      • GridDeletedEventArgs Class
      • GridDetailTableDataBindEventArgs Class
      • GridDropDownColumn Class
      • GridDropDownColumnEditor Class
      • GridDropDownListColumnEditor Class
      • GridEditableColumn Class
      • GridEditableItem Class
      • GridEditCommandColumn Class
      • GridEditFormInsertItem Class
      • GridEditFormItem Class
      • GridEditFormItem.EditFormTableCell Class
      • GridEditFormSettings Class
      • GridEditManager Class
      • GridException Class
      • GridExpandColumn Class
      • GridExportSettings Class
      • GridFilterFunction Class
      • GridFilterFunction.FunctionEntry Class
      • GridFilterFunction.StringFunctionEntry Class
      • GridFilteringException Class
      • GridFilteringItem Class
      • GridFilteringParamsException Class
      • GridFilterMenu Class
      • GridFooterItem Class
      • GridGroupByException Class
      • GridGroupByExpression Class
      • GridGroupByExpressionCollection Class
      • GridGroupByExpressionCollection.GridGroupByExpressionEnumerator Class
      • GridGroupByField Class
      • GridGroupHeaderItem Class
      • GridGroupingContext Class
      • GridGroupingSettings Class
      • GridGroupPanel Class
      • GridGroupPanelImageButton Class
      • GridGroupPanelStyle Class
      • GridGroupsChangingEventArgs Class
      • GridGroupSplitterColumn Class
      • GridHeaderItem Class
      • GridHierarchySettings Class
      • GridHyperLinkColumn Class
      • GridImage Class
      • GridImageButton Class
      • GridIndexCollection Class
      • GridInitializeEditFormContainer Class
      • GridInitializePagerItem Class
      • GridInsertedEventArgs Class
      • GridInsertionObject Class
      • GridItem Class
      • GridItemBuilder.GroupingHelperDataRow Class
      • GridItemBuilder.GroupingHelperDataTable Class
      • GridItemCollection Class
      • GridItemCreated Class
      • GridItemDataBound Class
      • GridItemEventArgs Class
      • GridItemEventInfo Class
      • GridMenuItem Class
      • GridMenuItemClickEventArgs Class
      • GridMenuItemCollection Class
      • GridMultiRowItem Class
      • GridNeedDataSourceEventArgs Class
      • GridNestedViewItem Class
      • GridNoRecordsItem Class
      • GridNotSupportedException Class
      • GridObjectWithState Class
      • GridPageChangedEventArgs Class
      • GridPagerItem Class
      • GridPagerStyle Class
      • GridPageSizeChangedEventArgs Class
      • GridPagingManager Class
      • GridPanelItemsStyle Class
      • GridPdfSettings Class
      • GridPostBackReferences Class
      • GridPropertyEvaluator Class
      • GridRelationFields Class
      • GridResizing Class
      • GridRowIndicatorColumn Class
      • GridScrolling Class
      • GridSelecting Class
      • GridSelfHierarchySettings Class
      • GridSortCommandEventArgs Class
      • GridSortExpression Class
      • GridSortExpressionCollection Class
      • GridSortingSettings Class
      • GridSplitGroup Class
      • GridStatusBarItem Class
      • GridStatusBarItemDecorator Class
      • GridStatusBarItemSettings Class
      • GridStringArrayConverter Class
      • GridTableCell Class
      • GridTableHeaderCell Class
      • GridTableItemStyle Class
      • GridTableRow Class
      • GridTableView Class
      • GridTableViewCollection Class
      • GridTableViewCollection.GridDataTableEnumerator Class
      • GridTableViewRelation Class
      • GridTableViewRelation.GridRelationFieldsEnumerator Class
      • GridTemplateColumn Class
      • GridTemplateColumnEditor Class
      • GridTextBoxColumnEditor Class
      • GridTextButton Class
      • GridTextColumnEditor Class
      • GridTFoot Class
      • GridTHead Class
      • GridUpdatedEventArgs Class
      • GridValidationSettings Class
      • GroupItemCell Class
      • RadGrid Class
      • IGridColumnEditor Interface
      • IGridCommandEvent Interface
      • IGridEditableColumn Interface
      • IGridInsertItem Interface
      • GridAggregateFunction Enumeration
      • GridButtonColumnType Enumeration
      • GridChildLoadMode Enumeration
      • GridClientSettings.GridColumnsReorderMethod Enumeration
      • GridCommandItemDisplay Enumeration
      • GridDataSourcePersistenceMode Enumeration
      • GridEditFormType Enumeration
      • GridEditMode Enumeration
      • GridExpandColumnType Enumeration
      • GridFilterListOptions Enumeration
      • GridForceExtractValues Enumeration
      • GridGroupLoadMode Enumeration
      • GridGroupsChangingAction Enumeration
      • GridGroupSplitMode Enumeration
      • GridHeaderButtonType Enumeration
      • GridItemType Enumeration
      • GridKnownFunction Enumeration
      • GridPagerMode Enumeration
      • GridPagerPosition Enumeration
      • GridPaperSize Enumeration
      • GridRebindReason Enumeration
      • GridResetPageIndexAction Enumeration
      • GridSortOrder Enumeration
      • GridTableFrame Enumeration
      • GridTableLayout Enumeration
      • GridTableTextDirection Enumeration
  • Need for help
RadGrid Send comments on this topic.
NeedDataSource Event
See Also 
Telerik.WebControls Namespace > RadGrid Class : NeedDataSource Event


Fires when the grid is about to be bound and the data source must be assigned (is null/Nothing).

  

Event Data

The event handler receives an argument of type GridNeedDataSourceEventArgs containing data related to this event. The following GridNeedDataSourceEventArgs properties provide information specific to this event.

PropertyDescription
IsFromDetailTable Boolean property which specifies whether the GridTableView instance passed in the NeedDataSource handler is the MasterTableView or detail table.
RebindReason Determines what the rebind reason is which causes the NeedDataSource event to be raised
 

 

Namespace: Telerik.WebControls
Assembly: RadGrid (in RadGrid.dll)

Syntax

Visual Basic (Declaration) 
Public Event NeedDataSource() As GridNeedDataSourceEventHandler
Visual Basic (Usage)Copy Code
Dim instance As RadGrid
Dim handler As GridNeedDataSourceEventHandler
 
AddHandler instance.NeedDataSource, handler
C# 
public event GridNeedDataSourceEventHandler NeedDataSource()
 

Event Data

The event handler receives an argument of type GridNeedDataSourceEventArgs containing data related to this event. The following GridNeedDataSourceEventArgs properties provide information specific to this event.

PropertyDescription
IsFromDetailTable Boolean property which specifies whether the GridTableView instance passed in the NeedDataSource handler is the MasterTableView or detail table.
RebindReason Determines what the rebind reason is which causes the NeedDataSource event to be raised

Remarks

Using this event eliminates the need for calling RadGrid.DataBind when the grid content should be refreshed, due to a structural change.
For example if Edit command bubbles, grid will automatically rebind and display the item in edit mode, with no additional code.

Note that when you use NeedDataSource you need to assign manually the DataSource property only once in the event handler!

Important: You should never call Rebind() method in NeedDataSource event handler or DataBind() for the grid at any stage of the page lifecycle!

For more information related to Advanced Data Binding (i.e. with NeedDataSource) see the following Data binding article.

Requirements

Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family

See Also