Adding a Datacolumn to MS Access file not working

Hi

When i add a datacolumn to a dataset and then call Update on the dataset
then my MS Access datbase does not reflect the changes.(no coumn was added
to the table)



DataColumn newcolumn = new DataColumn("NewlyAdded",
System.Type.GetType("System.Int32"));


string mySelectQuery = "SELECT * FROM mytable";


DataSet mds = new DataSet();

OleDbDataAdapter mda = new OleDbDataAdapter(mySelectQuery, dbconnection);

mda.Fill(mds,"mytable");

mds.Tables["mytable"].Columns.Add(newcolumn);

mds.Tables["mytable"].AcceptChanges();


mds.Update(mdt2, "mytable");

dbconnection.Close();



What am i missing ?