Identify String got from <AppSettings> in web.config is Null

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miyakejess - 20 Sep 2004 08:37 GMT

Dear All,

I am facing a problem,
I would like to do something after getting a value of a key from AppSettings
in web.config file.
I'd also like to do something if there is no any key in the AppSettings.
I know that if there is no any key in the web.config, the string will be null.
So it will throw exception "null pointer reference"

I would like to know how to code the program to do something while it throw
exception.

Thanks

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Girish bharadwaj - 20 Sep 2004 11:27 GMT

If I understand you correctly, which I am not sure,

try {
String maybeThere = ConfigurationSettings.AppSettings["AreYouThere"];
if (maybeThere != null) {
//Well the string is not null, why dont I use it.
}
else {
//String is null. Dont use it.
}
}
catch (Exception e) {
for any exceptions..
}

The null exception occurs only if you blindly attempt to use a reference
without checking its validity. So, you can avoid it by just checking for not
being null.

Signature

Girish Bharadwaj
http://msmvps.com/gbvb

> Dear All,
>
[quoted text clipped - 9 lines]
>
> Thanks

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