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Another very simple option to display progress during an async postback is to use the Update Progress control.You can use this control to display status information to the user, while the Update Panel updates its content.

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.Let us see how to use some events of this class to display progress to the user while the Update Panel updates its contents.As shown in the code above, we first get a reference to the Page Request Manager and then wire up the initialize Request and end Request events to execute, when an async postback begins and ends respectively.control, already binding values from the database and displaying them, with the ability to add and delete entries from the table.I need to add editing functionality, but I've finally run into a block, and I can't find a way past it.

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