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FormViewUpdateEventArgs::OldValues Property

Gets a dictionary that contains the original non-key field name/value pairs for the record to update.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public:
property IOrderedDictionary^ OldValues {
	IOrderedDictionary^ get ();
}

Property Value

Type: System.Collections.Specialized::IOrderedDictionary
An IOrderedDictionary that contains a dictionary of the original non-key field name/value pairs for the record to update.

Use the OldValues property to access the original non-key field values for the updated record. For example, you can use these values to keep a log of updated records. Some data source controls, such as the SqlDataSource and ObjectDataSource controls, support conflict detection (optimistic concurrency checking). When the ConflictDetection property of one of these controls is set to ConflictOptions.CompareAllValues, the original values of the record are compared against the values in the data source before an update operation is performed. If a record has been modified by another user concurrently, the record is not updated.

NoteNote

The OldValues property does not contain key fields. If you allow the user to update the values of the key fields, the original key field values are stored in the Keys property. The updated values are stored in the NewValues property.

The NewValues property returns an OrderedDictionary object that implements the System.Collections.Specialized::IOrderedDictionary interface. The OrderedDictionary object contains System.Collections::DictionaryEntry objects that represent the fields of the updated record. To access the field names, use the Keys property of the OrderedDictionary object. Similarly, you can access the field values by using the Values property.

NoteNote

As a shortcut, you can also use the indexer of the OrderedDictionary object to access the field values directly. Data source controls that rely on the field order (such as AccessDataSource) can access field values only by index.

The following example demonstrates how to use the OldValues property to access the original values of the non-key fields for the record being updated.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, 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.

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