public Task PrintAsync()

@using System.Reflection
@using DevExpress.Blazor.Reporting.Models

<DxPdfViewer @ref="pdfViewer"
             DocumentContent="@DocumentContent"
             DocumentName="Custom name"
             CustomizeToolbar="OnCustomizeToolbar" />

@code {
    DxPdfViewer pdfViewer { get; set; }
    byte[] DocumentContent { get; set; }

    protected override async Task OnInitializedAsync() {
        Assembly assembly = Assembly.GetExecutingAssembly();
        Stream stream = assembly.GetManifestResourceStream("Pdf.DataSources.Document.pdf");

        using (var binaryReader = new BinaryReader(stream)) {
            DocumentContent = binaryReader.ReadBytes((int)stream.Length);
        }
    }
    protected void OnCustomizeToolbar(ToolbarModel toolbarModel) {
        toolbarModel.AllItems.Clear();

        var printToolbarItem = new ToolbarItem {
            Text = "Print",
            AdaptiveText = "Print",
            BeginGroup = true,
            Id = "Print",
            IconCssClass = "print-btn",
            Click = async (args) => {
                await pdfViewer.PrintAsync();
            }
        };

        var downloadToolbarItem = new ToolbarItem {
            Text = "Download",
            AdaptiveText = "Download",
            BeginGroup = true,
            Id = "Download",
            IconCssClass = "download-btn",
            Click = async (args) => {
                await pdfViewer.DownloadAsync();
            }
        };
        toolbarModel.AllItems.Add(printToolbarItem);
        toolbarModel.AllItems.Add(downloadToolbarItem);
    }
}

.print-btn {
    mask-image: url(/images/printer.svg);
    mask-repeat: no-repeat;
    mask-size: 100%;
    background-color: currentColor;
    --toolbar-icon-size: 25px;
}

.download-btn {
    mask-image: url(/images/download.svg);
    mask-repeat: no-repeat;
    mask-size: 100%;
    background-color: currentColor;
    --toolbar-icon-size: 25px;
}