using DevExpress.DashboardCommon;
using System;
using System.Windows;
using System.Xml.Linq;

namespace WpfDashboard_DashboardState
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public static readonly string PropertyName = "DashboardState";

        public MainWindow()
        {
            InitializeComponent();

        }

        DashboardState GetDataFromString(string customPropertyValue) {
            DashboardState dState = new DashboardState();
            if(!string.IsNullOrEmpty(customPropertyValue)) {
                var xmlStateEl = XDocument.Parse(customPropertyValue);
                dState.LoadFromXml(xmlStateEl);
            }
            return dState;
        }

        private void dashboardControl_DashboardLoaded(object sender, DevExpress.DashboardWpf.DashboardLoadedEventArgs e) {

        }
        private void dashboardControl_SetInitialDashboardState(object sender, DevExpress.DashboardWpf.SetInitialDashboardStateWpfEventArgs e)
        {
            var state = GetDataFromString(dashboardControl.Dashboard.CustomProperties.GetValue(PropertyName));
            e.InitialState = state;
        }
        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            var dState = dashboardControl.GetDashboardState();
            var stateValue = dState.SaveToXml().ToString(SaveOptions.DisableFormatting);
            dashboardControl.Dashboard.CustomProperties.SetValue("DashboardState", stateValue);
            dashboardControl.Dashboard.SaveToXml("SampleDashboardWithState.xml");
        }

       //...
    }
}

Imports DevExpress.DashboardCommon
Imports System
Imports System.Windows
Imports System.Xml.Linq

Namespace WpfDashboard_DashboardState
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window
        Public Shared ReadOnly PropertyName As String = "DashboardState"

        Public Sub New()
            InitializeComponent()

        End Sub

        Private Function GetDataFromString(ByVal customPropertyValue As String) As DashboardState
            Dim dState As New DashboardState()
            If (Not String.IsNullOrEmpty(customPropertyValue)) Then
                Dim xmlStateEl = XDocument.Parse(customPropertyValue)
                dState.LoadFromXml(xmlStateEl)
            End If
            Return dState
        End Function

        Private Sub dashboardControl_DashboardLoaded(ByVal sender As Object, ByVal e As DevExpress.DashboardWpf.DashboardLoadedEventArgs)

        End Sub
        Private Sub dashboardControl_SetInitialDashboardState(ByVal sender As Object, ByVal e As DevExpress.DashboardWpf.SetInitialDashboardStateWpfEventArgs)
            Dim state = GetDataFromString(dashboardControl.Dashboard.CustomProperties.GetValue(PropertyName))
            e.InitialState = state
        End Sub
        Private Sub Window_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)
            Dim dState = dashboardControl.GetDashboardState()
            Dim stateValue = dState.SaveToXml().ToString(SaveOptions.DisableFormatting)
            dashboardControl.Dashboard.CustomProperties.SetValue("DashboardState", stateValue)
            dashboardControl.Dashboard.SaveToXml("SampleDashboardWithState.xml")
        End Sub

       '...
    End Class
End Namespace

using DevExpress.DashboardCommon;
using DevExpress.DashboardWpf;
using System;
using System.Linq;
using System.Windows;
// ...
 private void DashboardControl_DashboardStateChanged(object sender, DashboardStateChangedWpfEventArgs e) {
    var newState = e.DashboardState;
    var message = string.Empty;
    foreach(DashboardItemState itemState in newState.Items) {
        var item = dashboardControl1.Dashboard.Items[itemState.ItemName];
        message += item.Name;
        if( itemState.DrillDownValues.Count != 0) {
            message += "\n" + "Filter Drill-Down:" + " " + string.Join("," , itemState.DrillDownValues);
        }
        if(itemState.MasterFilterValues.Count != 0) {
            message += "\n" + "Master Filter:" + " " + string.Join(" | ", itemState.MasterFilterValues.Select(v=> string.Join(",",v))); 
        }
        if (itemState.RangeFilterState.Selection.Minimum !=null || itemState.RangeFilterState.Selection.Maximum != null) {
            message += "\n" + "Range Filter:" + " " + ((DateTime)itemState.RangeFilterState.Selection.Minimum).ToString("y") + "-" + ((DateTime)itemState.RangeFilterState.Selection.Maximum).ToString("y");
        }
        message += Environment.NewLine;
        message += "\n";
    }
          TextEdit.Text = message;  
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWpf
Imports System
Imports System.Linq
Imports System.Windows
' ...
 Private Sub DashboardControl_DashboardStateChanged(ByVal sender As Object, ByVal e As DashboardStateChangedWpfEventArgs)
    Dim newState = e.DashboardState
    Dim message = String.Empty
    For Each itemState As DashboardItemState In newState.Items
        Dim item = dashboardControl1.Dashboard.Items(itemState.ItemName)
        message += item.Name
        If itemState.DrillDownValues.Count <> 0 Then
            message += Constants.vbLf & "Filter Drill-Down:" & " " & String.Join(",", itemState.DrillDownValues)
        End If
        If itemState.MasterFilterValues.Count <> 0 Then
            message += Constants.vbLf & "Master Filter:" & " " & String.Join(" | ", itemState.MasterFilterValues.Select(Function(v) String.Join(",",v)))
        End If
        If itemState.RangeFilterState.Selection.Minimum IsNot Nothing OrElse itemState.RangeFilterState.Selection.Maximum IsNot Nothing Then
            message += Constants.vbLf & "Range Filter:" & " " & (CDate(itemState.RangeFilterState.Selection.Minimum)).ToString("y") & "-" & (CDate(itemState.RangeFilterState.Selection.Maximum)).ToString("y")
        End If
        message += Environment.NewLine
        message += Constants.vbLf
    Next itemState
          TextEdit.Text = message
 End Sub

using DevExpress.DashboardCommon;
using DevExpress.DashboardWpf;
using System.Windows;
namespace WpfDashboard_DashboardState {

    public partial class MainWindow : Window {

        public MainWindow() {
            InitializeComponent();

        }

  private void DashboardControl_SetInitialDashboardState(object sender, SetInitialDashboardStateWpfEventArgs e) {
            var state = CreateDashboardState();
            e.InitialState = state;
        }

    public DashboardState CreateDashboardState(){
            DashboardState state = new DashboardState();
            //Clears selections in the LisxBox item.
            state.Items.Add(new DashboardItemState("listBoxDashboardItem1") {
                MasterFilterValues = new List<object[]>()
            });
            //The lines below clears all values if neutral filter mode is disabled:
            //state.Items.Add(new DashboardItemState("listBoxDashboardItem1") {
            // MasterFilterValues = null
            //});
            return state;
        }
    }
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWpf
Imports System.Windows
Namespace WpfDashboard_DashboardState

    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()

        End Sub

  Private Sub DashboardControl_SetInitialDashboardState(ByVal sender As Object, ByVal e As SetInitialDashboardStateWpfEventArgs)
            Dim state = CreateDashboardState()
            e.InitialState = state
  End Sub

    Public Function CreateDashboardState() As DashboardState
            Dim state As New DashboardState()
            'Clears selections in the LisxBox item.
            state.Items.Add(New DashboardItemState("listBoxDashboardItem1") With {.MasterFilterValues = New List(Of Object())()})
            'The lines below clears all values if neutral filter mode is disabled:
            'state.Items.Add(new DashboardItemState("listBoxDashboardItem1") {
            ' MasterFilterValues = null
            '});
            Return state
    End Function
    End Class
End Namespace