Gauge Class

using System;
using System.Windows.Forms;
using DevExpress.DashboardCommon;

namespace Dashboard_CreateGauges {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private GaugeDashboardItem CreateGauges(DashboardObjectDataSource dataSource) {

            GaugeDashboardItem gauges = new GaugeDashboardItem();
            gauges.ViewType = GaugeViewType.CircularHalf;
            gauges.DataSource = dataSource;

            Gauge gauge = new Gauge();
            gauge.ActualValue = new Measure("Extended Price", SummaryType.Sum);
            gauges.Gauges.Add(gauge);

            gauges.SeriesDimensions.Add(new Dimension("Sales Person"));

            return gauges;
        }
        private void Form1_Load(object sender, EventArgs e) {
            Dashboard dashboard = new Dashboard();
            DashboardObjectDataSource dataSource = new DashboardObjectDataSource();
            dashboard.DataSources.Add(dataSource);

            GaugeDashboardItem gauges = CreateGauges(dataSource);
            dashboard.Items.Add(gauges);

            dashboardViewer1.AsyncDataLoading += (s, ev) => {
                ev.Data = new nwindDataSetTableAdapters.SalesPersonTableAdapter().GetData();
            };
            dashboardViewer1.Dashboard = dashboard;
        }
    }
}

Imports System
Imports System.Windows.Forms
Imports DevExpress.DashboardCommon

Namespace Dashboard_CreateGauges
    Partial Public Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub
        Private Function CreateGauges(ByVal dataSource As DashboardObjectDataSource) As GaugeDashboardItem

            Dim gauges As New GaugeDashboardItem()
            gauges.ViewType = GaugeViewType.CircularHalf
            gauges.DataSource = dataSource

            Dim gauge As New Gauge()
            gauge.ActualValue = New Measure("Extended Price", SummaryType.Sum)
            gauges.Gauges.Add(gauge)

            gauges.SeriesDimensions.Add(New Dimension("Sales Person"))

            Return gauges
        End Function
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
            Dim dashboard As New Dashboard()
            Dim dataSource As New DashboardObjectDataSource()
            dashboard.DataSources.Add(dataSource)

            Dim gauges As GaugeDashboardItem = CreateGauges(dataSource)
            dashboard.Items.Add(gauges)

            AddHandler dashboardViewer1.AsyncDataLoading, Sub(s, ev)
                ev.Data = (New nwindDataSetTableAdapters.SalesPersonTableAdapter()).GetData()
            End Sub
            dashboardViewer1.Dashboard = dashboard
        End Sub
    End Class
End Namespace