using DevExpress.DashboardWeb;
//...            
WebDashboardExporter exporter = new WebDashboardExporter(DashboardConfigurator.Default);

Imports DevExpress.DashboardWeb
'...            
Private exporter As New WebDashboardExporter(DashboardConfigurator.Default)

using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using System;
using System.IO;
using System.Web.Mvc;

namespace MvcDashboard_ServerExport.Controllers {
    public class HomeController : Controller {
        public ActionResult Index() {
            return View();
        }

        [HttpPost]
        public ActionResult ExportDashboardToPdf(string DashboardID, string DashboardState) {
            using (MemoryStream stream = new MemoryStream()) {
                string dashboardID = DashboardID;
                DashboardState dashboardState = new DashboardState();
                dashboardState.LoadFromJson(DashboardState);

                DashboardPdfExportOptions pdfOptions = new DashboardPdfExportOptions();
                pdfOptions.ExportFilters = true;
                pdfOptions.DashboardStatePosition = DashboardStateExportPosition.Below;

                string dateTimeNow = DateTime.Now.ToString("yyyyMMddHHmmss");
                string filePath = "~/App_Data/Export/" + dashboardID + "_" + dateTimeNow + ".pdf";
                ASPxDashboardExporter exporter = new ASPxDashboardExporter(DashboardConfigurator.Default);
                exporter.ExportToPdf(dashboardID, stream, new System.Drawing.Size(1024, 768), dashboardState, pdfOptions);
                SaveFile(stream, filePath);

                ContentResult result = new ContentResult();
                result.Content = filePath;
                return result;
            }
        }

        private void SaveFile(MemoryStream stream, string path) {
            var fileStream = System.IO.File.Create(Server.MapPath(path));
            stream.WriteTo(fileStream);
            fileStream.Close();
        }
    }
}

Imports System.IO
Imports System.Web.Mvc
Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWeb

Namespace MvcDashboard_ServerExport.Controllers
    Public Class HomeController
        Inherits Controller

        Public Function Index() As ActionResult
            Return View()
        End Function

        <HttpPost> _
        Public Function ExportDashboardToPdf(ByVal DashboardID As String, ByVal DashboardState As String) As ActionResult
            Using stream As New MemoryStream()

                Dim dashboardID_Renamed As String = DashboardID

                Dim dashboardState_Renamed As New DashboardState()
                dashboardState_Renamed.LoadFromJson(DashboardState)

                Dim pdfOptions As New DashboardPdfExportOptions()
                pdfOptions.ExportFilters = True
                pdfOptions.DashboardStatePosition = DashboardStateExportPosition.Below

                Dim dateTimeNow As String = Date.Now.ToString("yyyyMMddHHmmss")
                Dim filePath As String = "~/App_Data/Export/" & dashboardID_Renamed & "_" & dateTimeNow & ".pdf"
                Dim exporter As New ASPxDashboardExporter(DashboardConfigurator.Default)
                exporter.ExportToPdf(dashboardID_Renamed, stream, New System.Drawing.Size(1024, 768), dashboardState_Renamed, pdfOptions)
                SaveFile(stream, filePath)

                Dim result As New ContentResult()
                result.Content = filePath
                Return result
            End Using
        End Function

        Private Sub SaveFile(ByVal stream As MemoryStream, ByVal path As String)
            Dim fileStream = System.IO.File.Create(Server.MapPath(path))
            stream.WriteTo(fileStream)
            fileStream.Close()
        End Sub
    End Class
End Namespace

function onBeforeRender(sender) {
    var control = sender.getDashboardControl();
    control.registerExtension(new DevExpress.Dashboard.DashboardPanelExtension(control));
    $("#buttonContainer").dxButton({
        text: "Export to PDF",
        onClick: function (param) {
            var dashboardID = control.dashboardContainer().id;
            var dashboardStateJson = control.dashboard().state();

            $.ajax({
                url: 'Home/ExportDashboardToPdf',
                data: {
                    DashboardID: dashboardID,
                    DashboardState: JSON.stringify(dashboardStateJson)
                },
                type: 'POST',
            }).success(function (result) {
                DevExpress.ui.notify('A dashboard was exported to ' + result, 'success', 5000);
            });
        }
    });
}

using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using DevExpress.XtraCharts;
using DevExpress.XtraReports.UI;
using System;
using System.Drawing;
using System.Linq;

protected void CustomizeExport(object sender, CustomExportWebEventArgs e) {
  foreach(var printControl in e.GetPrintableControls()) {
    if(printControl.Value is XRGaugeDashboardItem) {
      var gaugeItemName = printControl.Key;
      var gaugeDashboardItem = e.GetDashboardItem(gaugeItemName) as GaugeDashboardItem;
      foreach(var dashGaugeElement in gaugeDashboardItem.Gauges) {
        foreach(var gaugePanel in e.GetGaugeContext(gaugeItemName).GetPrintableGauges(dashGaugeElement).Cast<XRDashboardGauge>()) {
          if(gaugePanel != null) {
              gaugePanel.MainSeriesLabel.ForeColor = Color.Red;
          }
        }
      }
    }

    if(printControl.Value is XRChart) {
      var chartItemName = printControl.Key;
      var chartDashboardItem = e.GetDashboardItem(chartItemName) as ChartDashboardItem;
      foreach(var pane in chartDashboardItem.Panes) {
        if(pane.Series.Count > 0) {
          foreach(var dashSeries in pane.Series) {
            if(dashSeries != null) {
              var controlSeries = e.GetChartContext(chartItemName).GetControlSeries(dashSeries);
              if(controlSeries != null) {
                foreach(var ser in controlSeries) {
                  LineSeriesView view = ser.View as LineSeriesView;
                  if(view != null) {
                      view.LineStyle.DashStyle = DashStyle.DashDot;
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWeb
Imports DevExpress.XtraCharts
Imports DevExpress.XtraReports.UI
Imports System
Imports System.Drawing
Imports System.Linq

Protected Sub ASPxDashboard1_CustomExport(ByVal sender As Object, ByVal e As CustomExportWebEventArgs)
  For Each printControl In e.GetPrintableControls()
    If TypeOf printControl.Value Is XRGaugeDashboardItem Then
      Dim gaugeItemName = printControl.Key
      Dim gaugeDashboardItem = TryCast(e.GetDashboardItem(gaugeItemName), GaugeDashboardItem)
      For Each dashGaugeElement In gaugeDashboardItem.Gauges
        For Each gaugePanel In e.GetGaugeContext(gaugeItemName).GetPrintableGauges(dashGaugeElement).Cast(Of XRDashboardGauge)()
          If gaugePanel IsNot Nothing Then
              gaugePanel.MainSeriesLabel.ForeColor = Color.Red
          End If
        Next gaugePanel
      Next dashGaugeElement
    End If

    If TypeOf printControl.Value Is XRChart Then
      Dim chartItemName = printControl.Key
      Dim chartDashboardItem = TryCast(e.GetDashboardItem(chartItemName), ChartDashboardItem)
      For Each pane In chartDashboardItem.Panes
        If pane.Series.Count > 0 Then
          For Each dashSeries In pane.Series
            If dashSeries IsNot Nothing Then
              Dim controlSeries = e.GetChartContext(chartItemName).GetControlSeries(dashSeries)
              If controlSeries IsNot Nothing Then
                For Each ser In controlSeries
                  Dim view As LineSeriesView = TryCast(ser.View, LineSeriesView)
                  If view IsNot Nothing Then
                      view.LineStyle.DashStyle = DashStyle.DashDot
                  End If
                Next ser
              End If
            End If
          Next dashSeries
        End If
      Next pane
    End If
  Next printControl
End Sub