public Object DataSource { get; set; }

Public Property DataSource As Object
	Get
	Set

public:
property Object^ DataSource {
	Object^ get ();
	void set (Object^ value);
}

member DataSource : Object with get, set

public void SetDataSource(Grid grid)
{
    //Build a small datatable
    DataTable table = new DataTable();
    table.Columns.Add(new DataColumn("Column1"));
    table.Columns.Add(new DataColumn("Column2"));
    table.Rows.Add(new object[] { "Row0, Col0", "Row0, Col1" });
    table.Rows.Add(new object[] { "Row1, Col0", "Row1, Col1" });
    table.Rows.Add(new object[] { "Row2, Col0", "Row2, Col1" });

    //Attach datatable to the grid
    grid.Headers.AutoGenerate = true;
    grid.DataSource = table;

    //Get the first row in Grid
    Row row1 = grid.Rows[0];
    Console.WriteLine("Row1, Column1: value = {0}", row1["Column1"].Value);
    Console.WriteLine("Row1: index in Grid: {0}, index in Datasource = {1}", row1.VisibleIndex, row1.DataSourceIndex);

    //Sort the grid
    grid.Headers[0]["Column1"].SortDirection = SortDirection.Descending;
    Console.WriteLine("Row1: index in Grid: {0}, index in Datasource = {1}", row1.VisibleIndex, row1.DataSourceIndex);

    //Filter the row1
    row1.Filtered = true;
    Console.WriteLine("Row1: index in Grid: {0}, index in Datasource = {1}", row1.VisibleIndex, row1.DataSourceIndex);

    //Other row...
    Row row2 = grid.Rows[0];
    Console.WriteLine("Row2: index in Grid: {0}, index in Datasource = {1}", row2.VisibleIndex, row2.DataSourceIndex);
    Console.WriteLine("Row2, Column1: value = {0}", row2["Column1"].Value);
}

Output:
Row1, Column1: value = Row0, Col0
Row1: index in Grid: 0, index in Datasource = 0
Row1: index in Grid: 2, index in Datasource = 0
Row1: index in Grid: -1, index in Datasource = 0
Row2: index in Grid: 0, index in Datasource = 2
Row2, Column1: value = Row2, Col0