Dashboard dashboard = new Dashboard();
dashboard.LoadFromXml(@"Dashboards\dashboard1.xml");
DashboardParameter parameter = new DashboardParameter("CategoryName", typeof(string), "Beverages");
dashboard.Parameters.Add(parameter);

Dim dashboard As New Dashboard()
dashboard.LoadFromXml("Dashboards\dashboard1.xml")
Dim parameter As New DashboardParameter("CategoryName", GetType(String), "Beverages")
dashboard.Parameters.Add(parameter)

DashboardParameter parameter1 = new DashboardParameter("Parameter1", typeof(string), "Beverages", "Select a category:", true, null);

Dim parameter1 As New DashboardParameter("Parameter1", GetType(String), "Beverages", "Select a category:", True, Nothing)

StaticListLookUpSettings settings = new StaticListLookUpSettings();
settings.Values = new string[] {"Beverages", "Condiments"};
DashboardParameter parameter2 = new DashboardParameter("Parameter2", typeof(string), "Beverages", "Select a category:", true, settings);

Dim settings As New StaticListLookUpSettings()
settings.Values = New String() {"Beverages", "Condiments"}
Dim parameter2 As New DashboardParameter("Parameter2", GetType(String), "Beverages", "Select a category:", True, settings)

DynamicListLookUpSettings settings = new DynamicListLookUpSettings();
settings.DataSource = sqlDataSource;
settings.DataMember = "Categories";
settings.ValueMember = "CategoryID";
settings.DisplayMember = "CategoryName";
settings.SortOrder = DimensionSortOrder.Descending;
DashboardParameter parameter3 = new DashboardParameter("Parameter3", typeof(string), "1", "Select a category:", true, settings);

Dim settings As New DynamicListLookUpSettings()
settings.DataSource = sqlDataSource
settings.DataMember = "Categories"
settings.ValueMember = "CategoryID"
settings.DisplayMember = "CategoryName"
settings.SortOrder = DimensionSortOrder.Descending
Dim parameter3 As New DashboardParameter("Parameter3", GetType(String), "1", "Select a category:", True, settings)

using DevExpress.DashboardCommon;
using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
// ...

// Create a dashboard.
var dashboard = new Dashboard();

// Create an SQL Data Source.
MsSqlConnectionParameters msSqlParams = new MsSqlConnectionParameters();
msSqlParams.AuthorizationType = MsSqlAuthorizationType.Windows;
msSqlParams.ServerName = "localhost";
msSqlParams.DatabaseName = "Northwind";
DashboardSqlDataSource sqlDataSource = new DashboardSqlDataSource("Data Source 1", msSqlParams);

// Add queries.
SelectQuery queryCategories = SelectQueryFluentBuilder
    .AddTable("Categories")
    .SelectAllColumns()
    .Build("Categories");
sqlDataSource.Queries.Add(queryCategories);
SelectQuery queryProducts = SelectQueryFluentBuilder
    .AddTable("Products")
    .SelectAllColumns()
    .Filter("[Products.CategoryID] = ?categoryQueryParam")
    .Build("Products");
queryProducts.Parameters.Add(new QueryParameter("categoryQueryParam", typeof(DevExpress.DataAccess.Expression), new DevExpress.DataAccess.Expression("?pCategory")));
sqlDataSource.Queries.Add(queryProducts);
SelectQuery queryOrders = SelectQueryFluentBuilder
    .AddTable("Orders")
    .Join("Order Details", SqlJoinType.Inner, "OrderID")
    .Join("Products", SqlJoinType.Inner, "ProductID")
    .SelectAllColumns()
    .Filter("[Products.ProductID] = ?productsQueryParam")
    .Build("Orders");
queryOrders.Parameters.Add(new QueryParameter("productsQueryParam", typeof(DevExpress.DataAccess.Expression), new DevExpress.DataAccess.Expression("?pProducts")));
sqlDataSource.Queries.Add(queryOrders);

dashboard.DataSources.Add(sqlDataSource);

 // Create a Grid dashboard item.
var grid = new GridDashboardItem();
grid.DataSource = sqlDataSource;
grid.DataMember = "Orders";
grid.Columns.Add(new GridDimensionColumn(new Dimension("OrderDate", DateTimeGroupInterval.MonthYear)));
grid.Columns.Add(new GridDimensionColumn(new Dimension("ProductName")));
grid.Columns.Add(new GridMeasureColumn(new Measure("UnitPrice", SummaryType.Max)));
dashboard.Items.Add(grid);

// Assign the Dashboard to the Dashboard Control.
dashboardControl.Dashboard = dashboard;

// Create dashboard parameters.
dashboard.Parameters.Add(new DashboardParameter("pCategory", typeof(int), 1, string.Empty, true, new DynamicListLookUpSettings {
    DataSource = sqlDataSource,
    DataMember = "Categories",
    ValueMember = "CategoryID",
    DisplayMember = "CategoryName",

}));
dashboard.Parameters.Add(new DashboardParameter("pProducts", typeof(int), 1, string.Empty, true, new DynamicListLookUpSettings {
    DataSource = sqlDataSource,
    DataMember = "Products",
    ValueMember = "ProductID",
    DisplayMember = "ProductName",
}));

Imports DevExpress.DashboardCommon
Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
' ...

' Create a dashboard.
Private dashboard = New Dashboard()

' Create an SQL Data Source.
Private msSqlParams As New MsSqlConnectionParameters()
msSqlParams.AuthorizationType = MsSqlAuthorizationType.Windows
msSqlParams.ServerName = "localhost"
msSqlParams.DatabaseName = "Northwind"
Dim sqlDataSource As New DashboardSqlDataSource("Data Source 1", msSqlParams)

' Add queries.
Dim queryCategories As SelectQuery = SelectQueryFluentBuilder.AddTable("Categories").SelectAllColumns().Build("Categories")
sqlDataSource.Queries.Add(queryCategories)
Dim queryProducts As SelectQuery = SelectQueryFluentBuilder.AddTable("Products").SelectAllColumns().Filter("[Products.CategoryID] = ?productsQueryParam").Build("Products")
queryProducts.Parameters.Add(New QueryParameter("categoryQueryParam", GetType(DevExpress.DataAccess.Expression), New DevExpress.DataAccess.Expression("?pCategory")))
sqlDataSource.Queries.Add(queryProducts)
Dim queryOrders As SelectQuery = SelectQueryFluentBuilder.AddTable("Orders").Join("Order Details", SqlJoinType.Inner, "OrderID").Join("Products", SqlJoinType.Inner, "ProductID").SelectAllColumns().Filter("[Products.ProductID] = ?productsQueryParam").Build("Orders")
queryOrders.Parameters.Add(New QueryParameter("productsQueryParam", GetType(DevExpress.DataAccess.Expression), New DevExpress.DataAccess.Expression("?pProducts")))
sqlDataSource.Queries.Add(queryOrders)

dashboard.DataSources.Add(sqlDataSource)

 ' Create a Grid dashboard item.
Dim grid = New GridDashboardItem()
grid.DataSource = sqlDataSource
grid.DataMember = "Orders"
grid.Columns.Add(New GridDimensionColumn(New Dimension("OrderDate", DateTimeGroupInterval.MonthYear)))
grid.Columns.Add(New GridDimensionColumn(New Dimension("ProductName")))
grid.Columns.Add(New GridMeasureColumn(New Measure("UnitPrice", SummaryType.Max)))
dashboard.Items.Add(grid)

' Assign the Dashboard to the Dashboard Control.
dashboardControl.Dashboard = dashboard

' Create dashboard parameters.
dashboard.Parameters.Add(New DashboardParameter("pCategory", GetType(Integer), 1, String.Empty, True, New DynamicListLookUpSettings With {
    .DataSource = sqlDataSource,
    .DataMember = "Categories",
    .ValueMember = "CategoryID",
    .DisplayMember = "CategoryName"
}))
dashboard.Parameters.Add(New DashboardParameter("pProducts", GetType(Integer), 1, String.Empty, True, New DynamicListLookUpSettings With {
    .DataSource = sqlDataSource,
    .DataMember = "Products",
    .ValueMember = "ProductID",
    .DisplayMember = "ProductName"
}))

private void DashboardViewer_CustomParameters(object sender, CustomParametersEventArgs e) {
    var customParameter = e.Parameters.FirstOrDefault(p => p.Name == "parameterState");
    if (customParameter != null) {
        customParameter.Value = "Nevada";
    }
}

Public Sub OnCustomParameters(ByVal e As DevExpress.DashboardCommon.CustomParametersEventArgs)
    Dim customParameter = e.Parameters.FirstOrDefault(Function(p) p.Name = "parameterState")
    If customParameter IsNot Nothing Then
        customParameter.Value = "Nevada"
    End If
End Sub

using System;
using DevExpress.Mvvm.DataAnnotations;
using DevExpress.Mvvm;
using DevExpress.Mvvm.POCO;
using System.Linq;
using DevExpress.DashboardCommon;
using System.Collections.Generic;

namespace WPF_Dashboard_CustomParameters.ViewModels {
    [POCOViewModel]
    public class MyViewModel {
        protected MyViewModel() {
            //Dashboard = new SampleDashboard(); 
            Dashboard dashboard = new Dashboard();
            dashboard.LoadFromXml("Data\\SampleDashboard.xml");
            dashboard.Parameters.Add(CreateParameter());
            dashboard.DataSources[0].Filter = "[State] In (?parameterState)";
            Dashboard = dashboard;
        }
        public virtual DevExpress.DashboardCommon.Dashboard Dashboard { get; set; }
        private DashboardParameter CreateParameter() {
            DashboardParameter myDashboardParameter = new DashboardParameter();
            StaticListLookUpSettings staticListLookUpSettings1 = new StaticListLookUpSettings();
            myDashboardParameter.AllowMultiselect = true;
            // Parameter values displayed in the look-up editor.
            staticListLookUpSettings1.Values = new string[] { "Alabama", "Ohio", "Utah" };
            myDashboardParameter.LookUpSettings = staticListLookUpSettings1;
            myDashboardParameter.Name = "parameterState";
            myDashboardParameter.Type = typeof(string);
            // Default parameter value.
            myDashboardParameter.Value = new List<string> { "Ohio", "Utah" };

            return myDashboardParameter;
        }
        public void OnCustomParameters(DevExpress.DashboardCommon.CustomParametersEventArgs e) {
            var customParameter = e.Parameters.FirstOrDefault(p => p.Name == "parameterState");
            if (customParameter != null) {
                // Actual value used when retrieving data from the data source.
                customParameter.Value = "Nevada";
            }
        }
    }
}

Imports System
Imports DevExpress.Mvvm.DataAnnotations
Imports DevExpress.Mvvm
Imports DevExpress.Mvvm.POCO
Imports System.Linq
Imports DevExpress.DashboardCommon
Imports System.Collections.Generic

Namespace WPF_Dashboard_CustomParameters.ViewModels
    <POCOViewModel> _
    Public Class MyViewModel
        Protected Sub New()
            'Dashboard = new SampleDashboard(); 
            Dim dashboard_Renamed As New Dashboard()
            dashboard_Renamed.LoadFromXml("Data\SampleDashboard.xml")
            dashboard_Renamed.Parameters.Add(CreateParameter())
            dashboard_Renamed.DataSources(0).Filter = "[State] In (?parameterState)"
            Dashboard = dashboard_Renamed
        End Sub
        Public Overridable Property Dashboard() As DevExpress.DashboardCommon.Dashboard
        Private Function CreateParameter() As DashboardParameter
            Dim myDashboardParameter As New DashboardParameter()
            Dim staticListLookUpSettings1 As New StaticListLookUpSettings()
            myDashboardParameter.AllowMultiselect = True
            ' Parameter values displayed in the look-up editor.
            staticListLookUpSettings1.Values = New String() { "Alabama", "Ohio", "Utah" }
            myDashboardParameter.LookUpSettings = staticListLookUpSettings1
            myDashboardParameter.Name = "parameterState"
            myDashboardParameter.Type = GetType(String)
            ' Default parameter value.
            myDashboardParameter.Value = New List(Of String) From {"Ohio", "Utah"}
            Return myDashboardParameter
        End Function
        Public Sub OnCustomParameters(ByVal e As DevExpress.DashboardCommon.CustomParametersEventArgs)
            Dim customParameter = e.Parameters.FirstOrDefault(Function(p) p.Name = "parameterState")
            If customParameter IsNot Nothing Then
                ' Actual value used when retrieving data from the data source.
                customParameter.Value = "Nevada"
            End If
        End Sub
    End Class
End Namespace

public MainWindow() {
    InitializeComponent();
    DashboardState state1 = CreateDashboardState();
    dashboardControl.SetDashboardState(state1);
}

public DashboardState CreateDashboardState() {
    DashboardState state = new DashboardState();
    DashboardParameterState parameterState = new DashboardParameterState() {
        Name = "CategoryNameParameter",
        Type = typeof(string),
        Value = "Beverages"
    };
    state.Parameters.Add(parameterState);
    return state;
}

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

Public Sub New()
    InitializeComponent()
    Dim state1 As DashboardState = CreateDashboardState()
    dashboardControl.SetDashboardState(state1)
End Sub

Public Function CreateDashboardState() As DashboardState
    Dim state As New DashboardState()
    Dim parameterState As New DashboardParameterState() With {.Name = "CategoryNameParameter", .Type = GetType(String), .Value = "Beverages"}
    state.Parameters.Add(parameterState)
    Return state
End Function

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