Processes a callback event that targets a control.
Assembly: System.Web (in System.Web.dll)
When null is used as the event argument parameter, the string is serialized to "null" and sent back to the server. Because there is no way to distinguish between null and "null", you should avoid using null argument parameters with callbacks.
Exceptions thrown in will not prevent GetCallbackResult from being called and returning a result. To prevent GetCallbackResult from returning a result, set a flag when an exception is thrown in and return an empty string from GetCallbackResult.
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.