why use ?
- the execution will process
- try catch
- handle (?)
two method:(?)
- event handler
- customer logging
what event handler have?
- onError
- onTaskFailed
- onExecstatuschanged
- oninformation
- onpostexecute
- onpostvalidate
- onprevalidate
- onprogress
- onquerycancel
- onvariablechanged
- onwaring
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