problem with tableadapter.update

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C#

hi,

i am using: Visual C# 2008, SQL Express 2005

this is the code :

DataTable dt;
ProjectDS dsPro;
ProjectDSTableAdapters.tblCfgTableAdapter taCfg;
object[] ao

dt = dsPro.Tables["tblCfg"];

dt.BeginLoadData();
dt.LoadDataRow(ao,false); (ao : object[])
dt.EndLoadData();
taCfg.Update(dsPro.tblCfg);

there's no runtime error

dt has autoincrement-column, so ao contains 'null' for that column

after LoadDataRow : debug shows dt containes the new data autoincrement value however is -1

after taCfg.Update : in database-explorer the db-table DOES NOT contain that data

something missing in the code ?

thanks in advance