我循环执行列表以检查是否为false，这时会弹出一条消息，显示更新或删除。 但是，循环后仅弹出消息框。满足条件后如何立即弹出？

我的编码如下：

                foreach (var checkDist in distinctList)   //loop the record
                {
                    if (tbl == null)
                    {
                        string insertRst = TodoInsert();
                    }
                    else
                    {
                        string message = "CompanyNo: " + Dcompany + " with Location: " + Dloc + " found in database. Do You want to overwrite?";
                        ScriptManager.RegisterClientScriptBlock(this.Page,Page.GetType(),"Msg","confirm('" + message +"')",true);

                        string confirmValue = Request.Form["confirmValue"];
                        if (confirmValue == "Yes")
                        {
                            string value = "YES";
                        }
                        else
                        {
                            string value = "NO";
                        }
                    }
                }