GridViewExportExcel how export excel?

How i can export to excel?, as in the example of “Bussines Editor” in https://themes.dotvvm.com/editor, i tried:

var exporter = new  GridViewExportExcel<Customer>(new GridViewExportExcelSettings<Customer>());
           var gridView = Context.View.FindControlByClientId<DotVVM.BusinessPack.Controls.GridView>("data", true);

           using (var file = exporter.Export(gridView, Customers))
           {
               Context.ReturnFile(file, "excel.xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
           }

but I can not find the space name “GridViewExportExcel”, i have Bussinespack trial version. help me please?

[mrnustik]

@CharanSaradaSSD This is not an error. As described in the conversation above this is an internal exception of the DotVVM framework which is used for interrupting the current request and returning the file from it. Just skip it and your exported excel file should download after.

[mrnustik]

Just a note: In version 3.0.0 we have managed to make the Excel export much better. It provides support for all of Excel data types and extensibility points.

Right now the 3.0.0 version is in preview, but the Excel export should be stable. We are currently working on the documentation for it so it should be available soon.