Creates a System.Web.UI.WebControls.Parameter object with the specified name and default value, and appends it to the end of the collection.
The index value of the added item.
Use the ParameterCollection.Add(string, string) method to create and append a System.Web.UI.WebControls.Parameter object with a default value to the end of the collection. This implementation of the method creates the System.Web.UI.WebControls.Parameter object using the name and default value specified by the name and value parameters, respectively, and appends it to the collection.