Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

SqlDataSource.OldValuesParameterFormatString Property

Gets or sets a format string to apply to the names of any parameters that are passed to the Delete or Update method.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
public string OldValuesParameterFormatString { get; set; }
<asp:SqlDataSource OldValuesParameterFormatString="String" />

Property Value

Type: System.String
A string that represents a format string applied to the names of any oldValues parameters passed to the Delete or Update methods. The default is "{0}".

The OldValuesParameterFormatString format string is applied only to primary keys, such as those that are identified by the DataKeyNames property of the associated data-bound control, or in delete and update scenarios where the ConflictDetection property is set to the CompareAllValues value and a set of oldValues are passed to the corresponding data method. In this case, the format string is applied to each parameter name in the oldValues collection.

Two common scenarios where you might change the OldValuesParameterFormatString property are as follows:

  • To differentiate between old and new values in updates. When the ConflictDetection property is set to the CompareAllValues value, parameters for both the original and new values are added to the UpdateParameters collection. Without the formatting string, two parameters with the same name would be created for each data field. By changing the name of the original value parameter, you can compare the data to the original data source to detect conflicts and compare key values.

  • Some visual designers implement a particular naming scheme for original values and keys.

.NET Framework

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

Windows Phone 8.1, Windows Phone 8, 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.

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft. All rights reserved.