When i send data from a form to access database the first item always replace the first line in database

When i send data from a form to access database the first item always replace the first line in database and as a result when i run the form again it replaces the first item and i loose that data. My code:

this.asfalistratableBindingSource.EndEdit();
this.asfalistratableTableAdapter.Update(this.asfalistradbDataSet.asfalistratable);
this.asfalistratableBindingSource.AddNew();