If the SqlDataSourceView.DeleteCommand property contains a parameterized SQL query, the SqlDataSourceView.DeleteParameters collection contains any System.Web.UI.WebControls.Parameter objects that correspond to the parameter placeholders in the SQL string.

Parameter names might be affected by the SqlDataSourceView.OldValuesParameterFormatString property; specifically, if the name identifies a primary key, such as a key that is specified using the DataKeyNames property of a data-bound control, or in delete and update scenarios in which 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.

Depending on the ADO.NET provider, the order of the parameters in the SqlDataSourceView.DeleteParameters collection might be important. The System.Data.OleDb and System.Data.Odbc providers associate the parameters in the collection according to the order that the parameters appear in the parameterized SQL query. The System.Data.SqlClient provider, which is the default ADO.NET provider for the System.Web.UI.WebControls.SqlDataSource control, associates the parameters in the collection by matching the name of the parameter with the placeholder in the SQL query. For more information on parameterized SQL queries and commands, see Using Parameters with the SqlDataSource Control.