ClientScriptManager.RegisterOnSubmitStatement Method (Type, String, String)
Assembly: System.Web (in System.Web.dll)
An OnSubmit statement is uniquely identified by its key and its type. Statements with the same key and type are considered duplicates. Only one statement with a given type and key pair can be registered with the page. Attempting to register a statement that is already registered will not create a duplicate of the statement.
Call the IsOnSubmitStatementRegistered method to determine whether an OnSubmit statement is already registered with a given key and type pair and avoid unnecessarily attempting to add the script.
The script parameter of themethod can contain multiple script commands as long as they are properly delimited with a semicolon (;).
Theadds a script that is executed before the page is submitted and gives you an opportunity to cancel the submission.
For more information on HTML forms and the OnSubmit attribute, see the World Wide Web Consortium (W3C) Web site.
Available since 2.0