Formview onupdating

Posted by / 20-Sep-2017 17:33

Formview onupdating

For me, I have found that enterprise applications and applications of even modest complexity require a lot of business rules and control, and managing everything from scratch supports that from the get go.

I do use Bind, Eval, and User Controls heavily though.

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But I need to clear some combos below as the selection, if altered in the to box, needs to be re-selected.

NET Drop Down List(these two controls are absolutely different)?

Sql Data Source 命令逻辑由 4 个属性提供:Select Command、Insert Command、Update Command、Delete Command,它们都接收一个字符串(SQL 语句或存储过程名称);与之相应的 Select Command Type、Insert Command Type、Update Command Type、Delete Command Type 也要设置为 Text 或 Stored Procedure (Text 是默认值)。 下面是一个完整的 Sql Data Source ,它定义了从 Employees 表中读取记录的 SELECT 命令: 创建完数据源后,我们可以在设计时绑定控件,而不必在 Page. 严格并发检查 上面的示例更新使用 ID 匹配记录,这样的做法问题在于更新命令会不加选择的更新所有字段,带来的后果是可能会消除其他用户的更新,如果他们的更新介于你请求的页面和更新的页面之间。 第二步是告诉 Sql Data Source 如何命名保持原始值的参数。默认情况下,原始值被赋予和变化了的值相同的参数名称。事实上,它们覆盖了原始参数值。为了避免这一行为,你需要设置 Sql Data Source.

I encourage you to use whatever works for you in a given context, what will help you get the job done quickly, and employ techniques that you understand.

The difference is that Bind is a two-way bind (read and write) and Eval is a one way bind (read-only) from the Data Source. Item Updating Dim control As Drop Down List = Form View1. If you use Eval then remember that the Drop Down List is in a template of the Form View, so you have to get the actual Drop Down List by calling Find Control and setting the updated value to the e. The running form is shown in Figure 3, and the ASP.Here are the steps: The last steps require that you bind the Data Text Field and Data Value Field properties to the Customer IDData Source and the Selected Value to the original source's Customer ID.The Drop Down List should be configured to look like the ASP. The Data Source ID for the Drop Down List points at Customer IDData Source.To demonstrate data binding for a Drop Down List in a Form View switch the Form View to the Edit Item Template.You can use the Smart tags menu or switch to the ASP.

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The Edit Item Template will contain Text Box controls by default.