Gets or sets a format string to apply to the names of any parameters that are passed to the erload:System.Web.UI.WebControls.SqlDataSourceView.Delete or erload:System.Web.UI.WebControls.SqlDataSourceView.Update method.
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The SqlDataSourceView.OldValuesParameterFormatString format string is applied to primary keys only, such as those that are identified by the DataKeyNames property of the data-bound control or in delete and update scenarios where the SqlDataSourceView.ConflictDetection property is set to the System.Web.UI.ConflictOptions.CompareAllValues value and a set of oldValues is passed to the corresponding data method. In this case, the format string is applied to each parameter name in the oldValues collection. For more information, see SqlDataSource.OldValuesParameterFormatString.
The value of the SqlDataSourceView.OldValuesParameterFormatString property is stored in view state.