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Export Events

Updated on Aug 31, 2026

You can customize the files exported to Excel and CSV by using the OnBeforeExport and the OnAfterExport events exposed to the GridExcelExport and GridCsvExport tags.

OnBeforeExport

The OnBeforeExport event fires after the user clicks the ExcelExport or CsvExport button and before the export process starts. You can use the event to configure the exported Grid columns or change the exported data. The event handler receives a GridBeforeExcelExportEventArgs and GridBeforeCsvExportEventArgs object, depending on the type of export, which provides the following properties:

For Excel Export

Columns—List<GridExcelExportColumn>—A collection of all exportable columns in the Grid. These are all visible GridColumn instances. You can customize the following attributes of the Grid column before exporting it into Excel:
- Width—Define the width of the column in pixels.
- Title—Define the column title to be shown in the Excel file header.
- NumberFormat—Provide an Excel-compatible number/date format
- Field—Set the data bound field of the column.

To export a hidden Grid column that has its Visible parameter set to false, you can manually define an instance of the GridExcelExportColumn in the handler for the OnBeforeExport event and add that column to the args.Columns collection.

Data—IEnumerable<object>—Assign a custom collection of data to be exported to Excel, for example only the selected items in the Grid.
isCancelled— bool—Cancel the OnBeforeExcel event by setting the isCancelled property to true.

Using the Grid OnBeforeExport with Excel export

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For CSV Export

Data—IEnumerable<object>—Assign a custom collection of data to be exported to CSV, for example only the selected items in the Grid.
Columns—List<GridCsvExportColumn>—A collection of all exportable columns in the Grid. These are all visible GridColumn instances. You can customize the following attributes of the Grid column before exporting it into Excel:
- Title—Define the column title to be shown in the Excel file header.
- Field—Set the data bound field of the column.

To export a hidden Grid column that has its Visible parameter set to false, you can manually define an instance of the GridCsvExportColumn in the handler for the OnBeforeExport event and add that column to the args.Columns collection.

isCancelled— bool—Cancel the OnBeforeExcel event by setting the isCancelled field to true.

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For PDF Export

Columns—List<GridPdfExportColumn>—A collection of all exportable columns in the Grid. These are all visible GridColumn instances. You can customize the following attributes of the Grid column before exporting it into PDF:
- Width—Define the width of the column in pixels.
- Title—Define the column title to be shown in the PDF file header.
- NumberFormat—Provide a PDF-compatible number/date format.
- Field—Set the data bound field of the column.

To export a hidden Grid column that has its Visible parameter set to false, you can manually define an instance of the GridPdfExportColumn in the handler for the OnBeforeExport event and add that column to the args.Columns collection.

Data—IEnumerable<object>—Assign a custom collection of data to be exported to PDF, for example only the selected items in the Grid.
isCancelled— bool—Cancel the OnBeforeExcel event by setting the isCancelled property to true.

Using the Grid OnBeforeExport with PDF export

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OnAfterExport

The OnAfterExport event fires after OnBeforeExport and before the generated file is provided to the user. You can use the event to make changes to the exported file. The event handler receives a GridAfterExcelExportEventArgs or GridAfterCsvExportEventArgs object, depending on the type of export, which provides the following fields:

For Excel Export

Stream—MemoryStream—The output of the Excel export as a memory stream. The stream itself is finalized, so that the resource does not leak. To read and work with the stream, clone its available binary data to a new MemoryStream instance.

Get the stream of the exported Excel file

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For CSV Export

Stream—MemoryStream—The output of the CSV export as a MemoryStream. The stream itself is finalized, so that the resource does not leak. To read and work with the stream, clone its available binary data to a new MemoryStream instance.

Get the stream of the exported CSV file

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For PDF Export

Stream—MemoryStream—The output of the PDF export as a memory stream. The stream itself is finalized, so that the resource does not leak. To read and work with the stream, clone its available binary data to a new MemoryStream instance.

Get the stream of the exported PDF file

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Export Events

In This Article

OnBeforeExport

For Excel Export

For CSV Export

For PDF Export

OnAfterExport

For Excel Export

For CSV Export

For PDF Export

See Also