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System.Web.UI.WebControls.Parameter objects are not required to have a name; however, data source controls might use the parameter name to match a System.Web.UI.WebControls.Parameter object in a collection with a parameter in a SQL query or business method signature. For example, the System.Web.UI.WebControls.SqlDataSource control can use the name of the System.Web.UI.WebControls.Parameter object to match a placeholder in a parameterized SQL query. Similarly, the System.Web.UI.WebControls.SqlDataSource control can use the name of a System.Web.UI.WebControls.Parameter object in the SqlDataSource.FilterParameters collection to match a placeholder in the SqlDataSource.FilterExpression property. In some cases, the name is not used and the order in which the System.Web.UI.WebControls.Parameter object is added to a System.Web.UI.WebControls.ParameterCollection collection is more important. For more information, see Using the SqlDataSource and AccessDataSource Controls with Parameters and Using Parameters with the ObjectDataSource Control.
If the name of the parameter is changed, the Parameter.OnParameterChanged method is called.