Relationship DataTable and DataReader ?

Instead i load DataReader from syntax:

OleDbCommand cmd = new OleDbCommand(sSQL, Connl); 
OleDbDataReader dr = cmd.ExecuteReader();

now I want to put on the list DataTable list DataReader, how I want to find relationships syntax ?

public void DataReader(DataTable input) 
{ input .... ??? 
  OleDbDataReader dr = cmd.ExecuteReader();
  ... 
}