when i use fallowing code i am not getting any error but the data is updating in the databse.
  Dim table As DataTable
            Dim dr As DataRow
            table = ds.Tables("FEESDETAILS")
            dr = table.NewRow
            dr(0) = txtEnrollNO.Text
            dr(1) = txtName.Text
            dr(2) = txtDate.Text
            dr(3) = txtCourse.Text
            dr(4) = cmbGroup.SelectedItem
            dr(5) = txtAdmn.Text
            dr(6) = txtRegi.Text
            dr(7) = txtTfees.Text
            dr(8) = txtOthers.Text
            dr(9) = txtTotal.Text
            table.Rows.Add(dr)
            dgfeesdet.DataSource = table
            cb = New OleDbCommandBuilder(da)
            da.Update(ds, "FEESDETAILS"

hi,

 do this after "cb = New OleDbCommandBuilder(da)"
da.insertcommand=cb.getinsertcommand()
da.updatecommand=cb.getupdatecommand
da.deletecommand=cb.getdeletecommand

call da.update after this


Anubhav Kumar