Write value to web.config at runtime

Is this correct?

if (System.Configuration.ConfigurationManager.AppSettings["TEXTBOOK_ALLOW_BUY"] != null)
        {
            if (cballowbuytextbooks.Checked)
            {
                System.Configuration.ConfigurationManager.AppSettings.Set("TEXTBOOK_ALLOW_BUY","YES");
            }
            else
            {
                System.Configuration.ConfigurationManager.AppSettings.Set("TEXTBOOK_ALLOW_BUY", "NO");
            }
        }

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What if the name value pair does not exist?  Will the call to AppSettings.Set(  )   create the entry if it does not exist?
LVL 5
Tom KnowltonWeb developerAsked:
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disruptConnect With a Mentor Commented:
No that will not create the entry if it does not exist:

Look at this:

http://forums.asp.net/t/1690754.aspx/1?Modify+Web+config
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Tom KnowltonWeb developerAuthor Commented:
thx
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