private DataTableReader GetDataTableReader()
{  
    DataTable tbl = new DataTable("tblUsers");   
    tbl.Columns.Add("FirstName");
    tbl.Columns.Add("LastName");
    for (int i = 1; i <= 100; i++)
    {
        DataRow rowNew = tbl.NewRow();
        rowNew["FirstName"] = "First " + i.ToString();
        rowNew["LastName"] = "Last " + i.ToString();
        tbl.Rows.Add(rowNew);
    }
    return tbl.CreateDataReader();
}

private void Start() 
{
    DataTableReader reader = this.GetDataTableReader();
    while (reader.Read())
    {
        Console.WriteLine(reader["FirstName"].ToString());
    }
}