Occurs when the Value of a node belonging to this document is about to be changed.
Assembly: System.Xml (in System.Xml.dll)
This event allows the user to do extra checking and, if necessary, throw an exception to stop the operation. If an exception is thrown the XmlDocument returns to its original state. This event only applies to nodes that have a value.
All nodes created by this document, whether or not they have been inserted into the document, are included in this event.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.