How to Exit an application properly on Error

[Rob]

I have the following code...

Try
da.Fill(ds,"mys et")
Catch exc as exception
Msgbox("Check Connection string Info")
Ffrm.Dispose()
Application.Exi t()
Exit Sub
EndTry

I noticed that the Application.Exi t() alone did not exit the Sub
Procedure... so I added the Exit Sub. Why doesn't Application.Exi t()
alone work ?

Thanks!

[Cyril Gupta]

Re: How to Exit an application properly on Error

Hello,

You could try End.

You can also set all forms and classes to Nothing

myForm = Nothing

And then call End. I think Application.Exi t waits for the message queue to
finish proccessing... Maybe that is why it did not exit immediately.

Regards
Cyril Gupta

[Rob]

Re: How to Exit an application properly on Error

End works...

Regarding... "You can also set all forms and classes to Nothing"

Is there some generic code that one can run that will loop thru all "open"
objects and sets them to nothing ?

Thanks !

"Cyril Gupta" <nomail@mail.co m> wrote in message
news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...[color=blue]
> Hello,
>
> You could try End.
>
> You can also set all forms and classes to Nothing
>
> myForm = Nothing
>
> And then call End. I think Application.Exi t waits for the message queue to
> finish proccessing... Maybe that is why it did not exit immediately.
>
> Regards
> Cyril Gupta
>[/color]

[Herfried K. Wagner [MVP]]

Re: How to Exit an application properly on Error

"Rob" <rwchome@comcas t.net> schrieb:[color=blue]
> Regarding... "You can also set all forms and classes to Nothing"
>
> Is there some generic code that one can run that will loop thru all "open"
> objects and sets them to nothing ?[/color]

Setting the variables pointing to forms to 'Nothing' doesn't make much
sense. Instead, you may want to call the main form's 'Close' method and/or
the forms' 'Close' methods.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[m.posseth]

Re: How to Exit an application properly on Error

Using end to just end the lifecycle of an application is considered bad
coding practice

you should use End sparingly and only when you need and can terminate
immediatly ( normally you can`t , that is why it is bad coding practice :-)

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vblr7/html/vastmend.asp

The right way to end an application is to clean / interupt the calling
chain



regards

Michel Posseth [MCP]



"Rob" <rwchome@comcas t.net> wrote in message
news:lpednexIAa MjvlTeRVn-jw@comcast.com. ..[color=blue]
> End works...
>
> Regarding... "You can also set all forms and classes to Nothing"
>
> Is there some generic code that one can run that will loop thru all "open"
> objects and sets them to nothing ?
>
> Thanks !
>
> "Cyril Gupta" <nomail@mail.co m> wrote in message
> news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...[color=green]
>> Hello,
>>
>> You could try End.
>>
>> You can also set all forms and classes to Nothing
>>
>> myForm = Nothing
>>
>> And then call End. I think Application.Exi t waits for the message queue
>> to finish proccessing... Maybe that is why it did not exit immediately.
>>
>> Regards
>> Cyril Gupta
>>[/color]
>
>[/color]

[Rob]

Re: How to Exit an application properly on Error

Thanks Michel,

So my question kind of still remains... before using an "End" or even "Exit
Sub"....

Is there some generic code that will loop thru all "open"
objects and clean them up ?



"m.posseth" <michelp@nohaus ystems.nl> wrote in message
news:%2399oynSG GHA.648@TK2MSFT NGP14.phx.gbl.. .[color=blue]
> Using end to just end the lifecycle of an application is considered bad
> coding practice
>
> you should use End sparingly and only when you need and can terminate
> immediatly ( normally you can`t , that is why it is bad coding practice
> :-)
>
> http://msdn.microsoft.com/library/de...l/vastmend.asp
>
> The right way to end an application is to clean / interupt the calling
> chain
>
>
>
> regards
>
> Michel Posseth [MCP]
>
>
>
> "Rob" <rwchome@comcas t.net> wrote in message
> news:lpednexIAa MjvlTeRVn-jw@comcast.com. ..[color=green]
>> End works...
>>
>> Regarding... "You can also set all forms and classes to Nothing"
>>
>> Is there some generic code that one can run that will loop thru all
>> "open" objects and sets them to nothing ?
>>
>> Thanks !
>>
>> "Cyril Gupta" <nomail@mail.co m> wrote in message
>> news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...[color=darkred]
>>> Hello,
>>>
>>> You could try End.
>>>
>>> You can also set all forms and classes to Nothing
>>>
>>> myForm = Nothing
>>>
>>> And then call End. I think Application.Exi t waits for the message queue
>>> to finish proccessing... Maybe that is why it did not exit immediately.
>>>
>>> Regards
>>> Cyril Gupta
>>>[/color]
>>
>>[/color]
>
>[/color]

[m.posseth]

Re: How to Exit an application properly on Error


Rob ,,

Not that i know of ,,,, however it shouldn`t be necesary to do so cleaning
up the base object should result in the disposing of evenntuall satelites

if you need to use End to stop an app this means that something is wrong in
your apps design


regards

Michel Posseth [MCP]


"Rob" <rwchome@comcas t.net> wrote in message
news:Hdudncbvyr iIqVTeRVn-vg@comcast.com. ..[color=blue]
> Thanks Michel,
>
> So my question kind of still remains... before using an "End" or even
> "Exit Sub"....
>
> Is there some generic code that will loop thru all "open"
> objects and clean them up ?
>
>
>
> "m.posseth" <michelp@nohaus ystems.nl> wrote in message
> news:%2399oynSG GHA.648@TK2MSFT NGP14.phx.gbl.. .[color=green]
>> Using end to just end the lifecycle of an application is considered bad
>> coding practice
>>
>> you should use End sparingly and only when you need and can terminate
>> immediatly ( normally you can`t , that is why it is bad coding practice
>> :-)
>>
>> http://msdn.microsoft.com/library/de...l/vastmend.asp
>>
>> The right way to end an application is to clean / interupt the calling
>> chain
>>
>>
>>
>> regards
>>
>> Michel Posseth [MCP]
>>
>>
>>
>> "Rob" <rwchome@comcas t.net> wrote in message
>> news:lpednexIAa MjvlTeRVn-jw@comcast.com. ..[color=darkred]
>>> End works...
>>>
>>> Regarding... "You can also set all forms and classes to Nothing"
>>>
>>> Is there some generic code that one can run that will loop thru all
>>> "open" objects and sets them to nothing ?
>>>
>>> Thanks !
>>>
>>> "Cyril Gupta" <nomail@mail.co m> wrote in message
>>> news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...
>>>> Hello,
>>>>
>>>> You could try End.
>>>>
>>>> You can also set all forms and classes to Nothing
>>>>
>>>> myForm = Nothing
>>>>
>>>> And then call End. I think Application.Exi t waits for the message queue
>>>> to finish proccessing... Maybe that is why it did not exit immediately.
>>>>
>>>> Regards
>>>> Cyril Gupta
>>>>
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]

[Rob]

Re: How to Exit an application properly on Error

Let's say you have code that is going to fill a data set via a Command
object / stored proc...
If the connection string is bad (held in the config file) OR a stored proc
is missing (the one you are calling)... then for all intents and purposes my
program may as well shut down...

Do I only need to dispose of the Form ? what about any connections ? other
varibales ? What is left over as a "problem" if the application just "Ends"
at this point ?

Thanks,
Rob



"m.posseth" <michelp@nohaus ystems.nl> wrote in message
news:%23slblDTG GHA.3856@TK2MSF TNGP12.phx.gbl. ..[color=blue]
>
> Rob ,,
>
> Not that i know of ,,,, however it shouldn`t be necesary to do so cleaning
> up the base object should result in the disposing of evenntuall
> satelites
>
> if you need to use End to stop an app this means that something is wrong
> in your apps design
>
>
> regards
>
> Michel Posseth [MCP]
>
>
> "Rob" <rwchome@comcas t.net> wrote in message
> news:Hdudncbvyr iIqVTeRVn-vg@comcast.com. ..[color=green]
>> Thanks Michel,
>>
>> So my question kind of still remains... before using an "End" or even
>> "Exit Sub"....
>>
>> Is there some generic code that will loop thru all "open"
>> objects and clean them up ?
>>
>>
>>
>> "m.posseth" <michelp@nohaus ystems.nl> wrote in message
>> news:%2399oynSG GHA.648@TK2MSFT NGP14.phx.gbl.. .[color=darkred]
>>> Using end to just end the lifecycle of an application is considered bad
>>> coding practice
>>>
>>> you should use End sparingly and only when you need and can terminate
>>> immediatly ( normally you can`t , that is why it is bad coding practice
>>> :-)
>>>
>>> http://msdn.microsoft.com/library/de...l/vastmend.asp
>>>
>>> The right way to end an application is to clean / interupt the calling
>>> chain
>>>
>>>
>>>
>>> regards
>>>
>>> Michel Posseth [MCP]
>>>
>>>
>>>
>>> "Rob" <rwchome@comcas t.net> wrote in message
>>> news:lpednexIAa MjvlTeRVn-jw@comcast.com. ..
>>>> End works...
>>>>
>>>> Regarding... "You can also set all forms and classes to Nothing"
>>>>
>>>> Is there some generic code that one can run that will loop thru all
>>>> "open" objects and sets them to nothing ?
>>>>
>>>> Thanks !
>>>>
>>>> "Cyril Gupta" <nomail@mail.co m> wrote in message
>>>> news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...
>>>>> Hello,
>>>>>
>>>>> You could try End.
>>>>>
>>>>> You can also set all forms and classes to Nothing
>>>>>
>>>>> myForm = Nothing
>>>>>
>>>>> And then call End. I think Application.Exi t waits for the message
>>>>> queue to finish proccessing... Maybe that is why it did not exit
>>>>> immediately.
>>>>>
>>>>> Regards
>>>>> Cyril Gupta
>>>>>
>>>>
>>>>
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]

[m.posseth]

Re: How to Exit an application properly on Error

Well in my opinion your program should in the described situation raise an
exception , and so shutdown

regards

Michel Posseth [MCP]



"Rob" <rwchome@comcas t.net> wrote in message
news:7vmdnQLvU9 hJpVTeRVn-hw@comcast.com. ..[color=blue]
> Let's say you have code that is going to fill a data set via a Command
> object / stored proc...
> If the connection string is bad (held in the config file) OR a stored
> proc is missing (the one you are calling)... then for all intents and
> purposes my program may as well shut down...
>
> Do I only need to dispose of the Form ? what about any connections ?
> other varibales ? What is left over as a "problem" if the application
> just "Ends" at this point ?
>
> Thanks,
> Rob
>
>
>
> "m.posseth" <michelp@nohaus ystems.nl> wrote in message
> news:%23slblDTG GHA.3856@TK2MSF TNGP12.phx.gbl. ..[color=green]
>>
>> Rob ,,
>>
>> Not that i know of ,,,, however it shouldn`t be necesary to do so
>> cleaning up the base object should result in the disposing of evenntuall
>> satelites
>>
>> if you need to use End to stop an app this means that something is wrong
>> in your apps design
>>
>>
>> regards
>>
>> Michel Posseth [MCP]
>>
>>
>> "Rob" <rwchome@comcas t.net> wrote in message
>> news:Hdudncbvyr iIqVTeRVn-vg@comcast.com. ..[color=darkred]
>>> Thanks Michel,
>>>
>>> So my question kind of still remains... before using an "End" or even
>>> "Exit Sub"....
>>>
>>> Is there some generic code that will loop thru all "open"
>>> objects and clean them up ?
>>>
>>>
>>>
>>> "m.posseth" <michelp@nohaus ystems.nl> wrote in message
>>> news:%2399oynSG GHA.648@TK2MSFT NGP14.phx.gbl.. .
>>>> Using end to just end the lifecycle of an application is considered
>>>> bad coding practice
>>>>
>>>> you should use End sparingly and only when you need and can terminate
>>>> immediatly ( normally you can`t , that is why it is bad coding
>>>> practice :-)
>>>>
>>>> http://msdn.microsoft.com/library/de...l/vastmend.asp
>>>>
>>>> The right way to end an application is to clean / interupt the
>>>> calling chain
>>>>
>>>>
>>>>
>>>> regards
>>>>
>>>> Michel Posseth [MCP]
>>>>
>>>>
>>>>
>>>> "Rob" <rwchome@comcas t.net> wrote in message
>>>> news:lpednexIAa MjvlTeRVn-jw@comcast.com. ..
>>>>> End works...
>>>>>
>>>>> Regarding... "You can also set all forms and classes to Nothing"
>>>>>
>>>>> Is there some generic code that one can run that will loop thru all
>>>>> "open" objects and sets them to nothing ?
>>>>>
>>>>> Thanks !
>>>>>
>>>>> "Cyril Gupta" <nomail@mail.co m> wrote in message
>>>>> news:OqCDYRSGGH A.2704@TK2MSFTN GP15.phx.gbl...
>>>>>> Hello,
>>>>>>
>>>>>> You could try End.
>>>>>>
>>>>>> You can also set all forms and classes to Nothing
>>>>>>
>>>>>> myForm = Nothing
>>>>>>
>>>>>> And then call End. I think Application.Exi t waits for the message
>>>>>> queue to finish proccessing... Maybe that is why it did not exit
>>>>>> immediately.
>>>>>>
>>>>>> Regards
>>>>>> Cyril Gupta
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]