public class Exception: Iserializable, _Exception

{

…

}

//

throw new Exception(“…”);

try

{

…

}

catch(Exception e)

{

…

//e.TargetSite

//e.StackTrace

//e.HelpLink

//e.Data

}

System.SystemException

public class SystemException: Exception

{

…

}

NullReferenceException is SystemException

System.ApplicationException

public class ApplicationException: Exception

{

…

}

try{} catch(…){} catch(…){}…

try{}catch{}

finally block