How to write value to web.config

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I am using VS2005 to develop my web applicaiton.
I have some value defined in web.config, like:

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<appSettings>
<add key="CompanyName" value="NorthWind"/>
.....


I can use code to read the value, but how can I write the value back to
web.config after I change it?

 

[Kevin Spencer]

See:

http://msdn2.microsoft.com/en-us/library/system.configuration.appsettingssection.aspx

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.

 

[Mark Rae]

I can use code to read the value, but how can I write the value back to
web.config after I change it?

Generally, you wouldn't (need to) do this - web.config is typically used to
store static variables which never, ever change across all instances of your
web app... Typical examples might include the connection string to your
backend database, the address of your SMTP server, etc...

IMO, if you find yourself needing to change any of the settings in
web.config, you probably shouldn't be storing them there in the first
place...

Why do you need to change this value?

 

[Kevin Spencer]

This is only true in the .Net Framework 1.1. He mentioned using VS.Net 2005,
which means he's developing on the .Net 2.0 platform, where there are
configuration sections you can modify and save.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.

 

[Mark Rae]

This is only true in the .Net Framework 1.1. He mentioned using VS.Net
2005, which means he's developing on the .Net 2.0 platform, where there
are configuration sections you can modify and save.

Indeed - I didn't say it couldn't be done, only that IMO it wasn't a good
idea.

 

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I do according the article.
But it fail in run time at line:
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
The error message is
exePath must be specified when not running inside a stand alone exe.

How can I do?