What's wrong with my command Insert using a datagriedview : I'm trying to insert data into my database using a DataGriedView in C #. However when I click the save button appears the following error message:

    System.Data.OleDb.OleDbException was unhandled
       HResult = -2147217900
       Message = Syntax error in INSERT INTO statement.
       Source = Microsoft Office Access Database Engine
       ErrorCode = -2147217900

  


Here's the code I have:

  

      private void save_btn_Click(object sender, EventArgs e)
            {
              OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Stock.accdb");
    con.Open();
    
    for (int i = 0; i < dataGridView_insert.Rows.Count; i++)
    
    {
    
        OleDbCommand cmd = new OleDbCommand("INSERT INTO product(OV,Reference,Cod_Client,Client,Qtd,Type_product,Posicion_product,) VALUES ('" + dataGridView_insert.Rows[i].Cells["OV"].Value + "','" + dataGridView_insert.Rows[i].Cells["Reference"].Value + "','" + dataGridView_insert.Rows[i].Cells["Cod_Client"].Value + "','" + dataGridView_insert.Rows[i].Cells["Client"].Value + "','" + dataGridView_insert.Rows[i].Cells["Qtd"].Value + "','" + dataGridView_insert.Rows[i].Cells["Type_product"].Value + "','" + dataGridView_insert.Rows[i].Cells["Posicion_product"].Value + " ' ", con);
    
       cmd.ExecuteNonQuery();
    
    }
    
    con.Close();
            }


What is wrong?

Thanks in advance,