XML validation check constraints.
XML验证检查约束。
This event also contains a data validation check to see whether or not the selected date is prior to the current date.
该事件还包含一个数据合法性检查，以判断所选日期是否在当前日期之前。
If an XML validation check constraint exists on the XML column of the table, the user may need to validate the new XML value before the update either manually or by creating a trigger.
如果在表的xml列上存在XML验证检查约束，在手动更新或者通过触发器更新之前，用户可能需要验证新的xml值。
NET allows you to run code during this validation check so that you can write custom logic to check whether the page is valid.
NET允许您在此验证检查期间运行代码，以便可以编写用于检查页是否有效的自定义逻辑。
A validation error occurs if a value to be updated does not match the type of the property in the data class, or if it does not pass a custom validation check.
如果要更新的值与资料类别中的属性型别不符，或未通过自订验证检查，则会发生验证错误。
A validation error occurs if a value to be updated does not match the type of the property in the data class, or if it does not pass a custom validation check.
如果要更新的值与资料类别中的属性型别不符，或未通过自订验证检查，则会发生验证错误。
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