The names and types of the parameters that are contained in the ObjectDataSourceView.DeleteParameters collection must match the names and types of the parameters that are in the method specified by the ObjectDataSourceView.DeleteMethod property signature. The parameter names are affected by the ObjectDataSourceView.OldValuesParameterFormatString property and are case sensitive. When working with data-bound controls that supply parameters, such as System.Web.UI.WebControls.GridView and System.Web.UI.WebControls.DetailsView, the System.Web.UI.WebControls.ObjectDataSource control automatically merges any parameters that are explicitly specified in the collection with those parameters that are provided by the data-bound control.

For more information, see ObjectDataSource.DeleteMethod.