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

Parameter names might be affected by the SqlDataSource.OldValuesParameterFormatString property; specifically, if the name identifies a primary key, such as a key that is specified using the DataKeyNames property, or in delete and update scenarios where the SqlDataSource.ConflictDetection property is set to the System.Web.UI.ConflictOptions.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.

Depending on the ADO.NET provider, the order of the parameters in the SqlDataSourceView.UpdateParameters collection might be important. The System.Data.OleDb and System.Data.Odbc providers associate the parameters in the collection according to the order in which 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 a placeholder alias in the SQL query. For more information on parameterized SQL queries and commands, see Using Parameters with the SqlDataSource Control.