JavaScript确认消息后，按钮单击事件有时不会回发

Question

我正在研究一个asp.net Webforms项目。我在网格视图中动态创建按钮。单击时，应显示一个JavaScript确认弹出框。当用户单击“确定”按钮时，它应该转到按钮单击事件并执行数据库更新。否则，什么都不做。代码如下。大多数情况下，它都能正常工作。但是有时，没有到达背后的代码。当我第二次单击按钮时，它将回发。我尝试了Implementing javascript confirm box in code behind C#提供的解决方案，并发现了类似的行为。

         Button being created dynamically:
         Button btnMarkSaved = new Button();
         btnMarkSaved .CssClass = "ArrangeButtons grayButtonStyle";
         btnMarkSaved .Height = Unit.Pixel(30);
         btnMarkSaved .Text = "Mark as Saved";
         btnMarkSaved .CausesValidation = false;
         btnMarkSaved .ID = "btnMarkSaved_" + clientId + "_" + orderId + "_" + storeId;
         this.btnMarkSaved.Click += new System.EventHandler(this.btnMarkSaved_Click);
         this.btnMarkSaved.OnClientClick = "return confirm('Are you sure to tag the issue 
             as saved?');";

        Code behind method:
        protected void btnMarkSaved_Click(Object sender, System.EventArgs e)
            {
                    String[] btnIDFields;               
                    btnIDFields = btn.ID.Split('_');
                    UpdateOrderHistory(btnIDFields[2]);
            }