DataGridView不同步更新数据库,在线等

我自己写的代码!但是我写的代码只更新了DataGridView,并没有更新库,麻烦帮解决下,附代码如下: 
当点击确定按钮时执行的代码 
int scount = Convert.ToInt32(this.updateCount.Text.Trim().ToString()); 
                    zcount = lcount + scount;//lcount是库中有的数量scount是增加的数量 
                    String str = "update drugs set drugsCount="+zcount+" where drugsId="+lid; 
                    if (da.insertDrugs(str)) 
                    { 
                        dgvBean(); 
                        lcount = zcount; 
                        this.updateCount.Text = ""; 
                    } 
                    else 
                    { 
                        MessageBox.Show("添加失败!!!"); 
                        this.Close(); 
                    } 
这个是调用的类 
public Boolean changePass(string pass) 
        { 
            try 
            { 
                String sql = "update login set LoginPass='" + pass + "' where id = 1"; 
                OleDbCommand cmd = new OleDbCommand(sql, oc); 
                oc.Open(); 
                int count = Convert.ToInt32(cmd.ExecuteNonQuery().ToString()); 
                if (count > 0) 
                { 
                    return true; 
                } 
                else 
                { 
                    return false; 
                } 
            } 
            catch (Exception ex) 
            { 
                return false; 
            } 
            finally 
            { 
                oc.Close(); 
            }         }