public string FilterText { get; set; }

Public Property FilterText As String

using DevExpress.DashboardCommon;
using DevExpress.DashboardCommon.ViewerData;
using DevExpress.DashboardWin;
using System.Data;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace CalculateHIddenTotalsExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            dashboardViewer1.CalculateHiddenTotals = true;
            dashboardViewer1.ConfigureDataConnection += DashboardViewer1_ConfigureDataConnection;
            dashboardViewer1.CustomizeDashboardItemCaption += DashboardViewer1_CustomizeDashboardItemCaption;

            // Load the dashboard after all DashboardViewer options are set.
            dashboardViewer1.DashboardSource = typeof(Dashboard1);
        }
        private void DashboardViewer1_CustomizeDashboardItemCaption(object sender, CustomizeDashboardItemCaptionEventArgs e)
        {
            DashboardViewer viewer = (DashboardViewer)sender;
            if (e.DashboardItemName == "pieDashboardItem1")
            {
                DashboardToolbarItem infoButton = new DashboardToolbarItem();
                MultiDimensionalData mData = viewer.GetItemData(e.DashboardItemName);
                var orderCount = mData.GetValue(mData.GetMeasures().Where(m => m.DataMember == "OrderID").First()).Value ?? 0;
                e.FilterText += string.Format("{0:N0} distinct orders are displayed", orderCount);
            }
        }

        private void DashboardViewer1_ConfigureDataConnection(object sender, DashboardConfigureDataConnectionEventArgs e)
        {
            ExtractDataSourceConnectionParameters parameters = e.ConnectionParameters as ExtractDataSourceConnectionParameters;
            if (parameters != null) parameters.FileName = Path.GetFileName(parameters.FileName);
        }

    }
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardCommon.ViewerData
Imports DevExpress.DashboardWin
Imports System.Data
Imports System.IO
Imports System.Linq
Imports System.Windows.Forms

Namespace CalculateHIddenTotalsExample
    Partial Public Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
            dashboardViewer1.CalculateHiddenTotals = True
            AddHandler dashboardViewer1.ConfigureDataConnection, AddressOf DashboardViewer1_ConfigureDataConnection
            AddHandler dashboardViewer1.CustomizeDashboardItemCaption, AddressOf DashboardViewer1_CustomizeDashboardItemCaption

            ' Load the dashboard after all DashboardViewer options are set.
            dashboardViewer1.DashboardSource = GetType(Dashboard1)
        End Sub
        Private Sub DashboardViewer1_CustomizeDashboardItemCaption(ByVal sender As Object, ByVal e As CustomizeDashboardItemCaptionEventArgs)
            Dim viewer As DashboardViewer = DirectCast(sender, DashboardViewer)
            If e.DashboardItemName = "pieDashboardItem1" Then
                Dim infoButton As New DashboardToolbarItem()
                Dim mData As MultiDimensionalData = viewer.GetItemData(e.DashboardItemName)
                Dim orderCount = If(mData.GetValue(mData.GetMeasures().Where(Function(m) m.DataMember = "OrderID").First()).Value, 0)
                e.FilterText &= String.Format("{0:N0} distinct orders are displayed", orderCount)
            End If
        End Sub

        Private Sub DashboardViewer1_ConfigureDataConnection(ByVal sender As Object, ByVal e As DashboardConfigureDataConnectionEventArgs)
            Dim parameters As ExtractDataSourceConnectionParameters = TryCast(e.ConnectionParameters, ExtractDataSourceConnectionParameters)
            If parameters IsNot Nothing Then
                parameters.FileName = Path.GetFileName(parameters.FileName)
            End If
        End Sub

    End Class
End Namespace

{
    e.FilterText = string.Format(" {0}", dDesigner.Parameters[0].SelectedValue);
}

if (filterValues.Count > 0)
    e.FilterText = string.Format(" ( Filter: {0})", string.Concat(filterValues.Select(
        axp => string.Format("{0} ", axp.GetAxisPoint(axp.AvailableAxisNames[0]).DisplayText)).ToArray()));

If Equals(e.DashboardItemName, "chartDashboardItem1") AndAlso dDesigner.Parameters.Count > 0 Then
    e.FilterText = String.Format(" {0}", dDesigner.Parameters(0).SelectedValue)
End If

If filterValues.Count > 0 Then
    e.FilterText = String.Format(" ( Filter: {0})", String.Concat(filterValues.Select(Function(axp) String.Format("{0} ", axp.GetAxisPoint(axp.AvailableAxisNames(0)).DisplayText)).ToArray()))
End If