Registers code on the page for client-side validation.
Assembly: System.Web (in System.Web.dll)
Use the method to register code on the page to perform client-side validation.
This method is used primarily by control developers.
Call this method in the PreRender event handler of the derived class to register the code that performs client-side validation.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.