dataTable . Select property

i have a DataTable ... and am adding a new row to it then am watching the table rows Count property and it is = 1 ,,, which means that my new row is added... then am trying to read my row using table["myTableName"].select() property - with out any filter string - but the dataRow[] list that should return is empty ... i dont know why ... another thing ... the table is not related to any database table ... i just use it in my project to add and retrieve data... thanks..............