public Action<GridExportCustomizeSheetHeaderFooterEventArgs> CustomizeSheetHeader { get; set; }

@using DevExpress.Printing.ExportHelpers
@using DevExpress.Export
@using DevExpress.Export.Xl
@using DevExpress.Drawing

<DxGrid @ref="@Grid" Data="@Data">
    <Columns>
        <DxGridDataColumn FieldName="ContactName" />
        <DxGridDataColumn FieldName="ContactTitle" />
        <DxGridDataColumn FieldName="CompanyName" />
        <DxGridDataColumn FieldName="City" />
        <DxGridDataColumn FieldName="Country" />
        <DxGridDataColumn FieldName="Phone" />
    </Columns>
</DxGrid>
<DxButton Text="Export to XLSX" Click="ExportXlsx_Click" />

@code {
    DxGrid Grid { get; set; }
    IEnumerable<Supplier> Data { get; set; }
    protected override async Task OnInitializedAsync() {
        Data = await NwindDataService.GetSuppliersAsync();
    }
    async Task ExportXlsx_Click() {
        var options = new GridXlExportOptions();
        options.CustomizeSheetFooter = e => {
            // See the CustomizeSheetFooter action description.
        };

        options.CustomizeSheetHeader = e => {
            // Specify cell formatting. 
            var FirstCellFormat = new XlFormattingObject();
            FirstCellFormat.Font = new XlCellFont();
            FirstCellFormat.Font.Size = 24;
            FirstCellFormat.Font.Bold = true;
            FirstCellFormat.Alignment = new XlCellAlignment();
            FirstCellFormat.Alignment.HorizontalAlignment = XlHorizontalAlignment.Center;
            FirstCellFormat.Alignment.VerticalAlignment = XlVerticalAlignment.Center;
            var SecondCellFormat = FirstCellFormat;
            SecondCellFormat.Font.Size = 18;

            // Add an image to the top of the document.
            for (var i = 0; i < 8; i++) {
                e.ExportContext.AddRow();
            }
            var ImageCellRange = new XlCellRange(new XlCellPosition(0, 0), new XlCellPosition(5, 7));
            e.ExportContext.MergeCells(ImageCellRange);   
            var fileName = @"C:\temp\DevExpress-Logo.png";
            using (FileStream outfile = new FileStream(fileName, FileMode.Open))
                e.ExportContext.InsertImage(DXImage.FromStream(outfile), ImageCellRange);

            // Add an empty row.
            e.ExportContext.AddRow();
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 8), new XlCellPosition(5, 8)));

            // Add rows with company contacts.
            var AddressCellName = new CellObject { Value = "Address :", Formatting = FirstCellFormat };
            var AddressCellLocation = new CellObject { Value = "505 N. Brand Blvd Suite 1450", Formatting = SecondCellFormat };
            e.ExportContext.AddRow(new[] { AddressCellName, null, AddressCellLocation });
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 9), new XlCellPosition(1, 10)));
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(2, 9), new XlCellPosition(5, 9)));

            var AddressCellLocation2 = new CellObject { Value = "Glendale CA 91203 USA", Formatting = SecondCellFormat };
            e.ExportContext.AddRow(new[] { null, null, AddressCellLocation2 });
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(2, 10), new XlCellPosition(5, 10)));

            var PhoneCellName = new CellObject { Value = "Phone :", Formatting = FirstCellFormat };
            var PhoneCellLocation = new CellObject { Value = "+ 1 (818) 844-3383", Formatting = SecondCellFormat };
            e.ExportContext.AddRow(new[] { PhoneCellName, null, PhoneCellLocation });
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 11), new XlCellPosition(1, 11)));
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(2, 11), new XlCellPosition(5, 11)));

            var FaxCellName = new CellObject { Value = "Fax :", Formatting = FirstCellFormat };
            var FaxCellLocation = new CellObject { Value = "+ 1 (818) 844-3395", Formatting = SecondCellFormat };
            e.ExportContext.AddRow(new[] { FaxCellName, null, FaxCellLocation });
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 12), new XlCellPosition(1, 12)));
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(2, 12), new XlCellPosition(5, 12)));

            var EmailCellName = new CellObject { Value = "Email :", Formatting = FirstCellFormat };
            var EmailCellLocation = new CellObject { Value = "[email protected]" };
            EmailCellLocation.Hyperlink = "mailto:[email protected]";
            e.ExportContext.AddRow(new[] { EmailCellName, null, EmailCellLocation });
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 13), new XlCellPosition(1, 13)));
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(2, 13), new XlCellPosition(5, 13)));

            // Add an empty row.
            e.ExportContext.AddRow();
            e.ExportContext.MergeCells(new XlCellRange(new XlCellPosition(0, 14), new XlCellPosition(5, 14)));
        };
       await Grid.ExportToXlsxAsync("ExportResult", options);
    }
}