ColumnView.GetDataSourceRowIndex(Int32) Method

using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Views.Grid;

public partial class Form1 : Form {
    public Form1() {
        InitializeComponent();

        GridControl gridControl1 = new GridControl { Parent = this, Dock = DockStyle.Fill };
        GridView gridView1 = new GridView();
        gridControl1.MainView = gridView1;
        gridView1.OptionsBehavior.Editable = false;

        Random r = new Random();
        List<MyObject> dataSource = new List<MyObject>();
        for (int i = 0; i < 5; i++) 
            dataSource.Add(new MyObject { Id = r.Next(0, 100), Name = string.Format("Name {0}", i) });
        gridControl1.DataSource = dataSource;

        gridView1.Columns["Id"].SortOrder = DevExpress.Data.ColumnSortOrder.Descending;
        gridView1.CustomDrawRowIndicator += gridView_CustomDrawRowIndicator;
        gridView1.IndicatorWidth = 30;
    }

    void gridView_CustomDrawRowIndicator(object sender, RowIndicatorCustomDrawEventArgs e) {
        if (!e.Info.IsRowIndicator) return;
        GridView view = sender as GridView;
        int dataSourceRowIndex = view.GetDataSourceRowIndex(e.RowHandle);
        e.Info.DisplayText = dataSourceRowIndex.ToString();
    }

    public class MyObject {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Views.Grid

Partial Public Class Form1
    Public Sub New()
        InitializeComponent()

        Dim gridControl1 As GridControl = New GridControl With {
            .Parent = Me,
            .Dock = DockStyle.Fill
        }
        Dim gridView1 As GridView = New GridView()
        gridControl1.MainView = gridView1
        gridView1.OptionsBehavior.Editable = False
        Dim r As Random = New Random()
        Dim dataSource As List(Of MyObject) = New List(Of MyObject)()

        For i As Integer = 0 To 4
            dataSource.Add(New MyObject With {
                .Id = r.[Next](0, 100),
                .Name = String.Format("Name {0}", i)
            })
        Next

        gridControl1.DataSource = dataSource
        gridView1.Columns("Id").SortOrder = DevExpress.Data.ColumnSortOrder.Descending
        AddHandler gridView1.CustomDrawRowIndicator, AddressOf gridView_CustomDrawRowIndicator
        gridView1.IndicatorWidth = 30
    End Sub

    Private Sub gridView_CustomDrawRowIndicator(ByVal sender As Object, ByVal e As RowIndicatorCustomDrawEventArgs)
        If Not e.Info.IsRowIndicator Then Return
        Dim view As GridView = TryCast(sender, GridView)
        Dim dataSourceRowIndex As Integer = view.GetDataSourceRowIndex(e.RowHandle)
        e.Info.DisplayText = dataSourceRowIndex.ToString()
    End Sub
End Class

Public Class MyObject
    Public Property Id As Integer
    Public Property Name As String
End Class