Updating date & time for all the rows?

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (dataGridView1.Columns[e.ColumnIndex].Name == "Submit")
{

using (OleDbConnection con1 = new OleDbConnection(con))
{
con1.Open();
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
cmd = new OleDbCommand();
cmd.Connection = con1;
string query1 = "Update Spldetails set ID = @id,Status = @sts,Comment =@cmnt,Approvedhrs =@aphr,Reviewer = ('" + label5.Text + "'),Revieweddate = ('"+dateTimePicker3.Value+"') where ID =@id";
cmd.Parameters.AddWithValue("@id", dataGridView1.Rows[i].Cells[0].Value);
cmd.Parameters.AddWithValue("@sts", dataGridView1.Rows[i].Cells[11].Value);
cmd.Parameters.AddWithValue("@cmnt", dataGridView1.Rows[i].Cells[12].Value);
cmd.Parameters.AddWithValue("@aphr", dataGridView1.Rows[i].Cells[13].Value);
cmd.Parameters.AddWithValue("('" + label5.Text + "')", dataGridView1.Rows[i].Cells[14].Value);
cmd.Parameters.AddWithValue("('" + dateTimePicker3.Value + "')", dataGridView1.Rows[i].Cells[15].Value);

cmd.CommandText = query1;
cmd.ExecuteNonQuery();

//spldetailsBindingSource.EndEdit();
//spldetailsTableAdapter.Update(updatedata);

}
MessageBox.Show("Your Details have been Submitted successfully....!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}