Unable to read web config file value

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Hi, I have a value set in web config and I want to read it in my codes. But whenever I run it, it returns argumentnullvalue exception. I have previously successfully read the value for other key but it failed this time.
Below are my codes:

XML

<appSettings>
<add key="FlagWebAPI" value="true"/>
</appSettings>

C#

public bool FlagWebAPI 
        {
            get 
            {
                bool flag;
                flag = Boolean.Parse(ConfigurationManager.AppSettings["FlagWebAPI"]);

                return flag;
            }
            set { }
        }

What I have tried:

1. Tried to remove boolean parsing and and convert data type to string but getting the same error message.

Posted 20-Apr-16 23:27pm

Jamie888

Updated 20-Apr-16 23:53pm

v2

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Comments

Karthik_Mahalingam 21-Apr-16 5:41am

make sure you have added your key under app settings tag
could you post your web.config app settings part.

1 solution

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F-ES Sitecore · Accepted Answer · 2016-04-20T23:37:00

Solution 1

Then you won't be putting the setting in the right place in the web.config, or there is something else about your set-up you're not telling us.

XML

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <appSettings>
    <add key="FlagWebAPI" value="true"/>
  </appSettings>

Posted 20-Apr-16 23:37pm

F-ES Sitecore

Comments

Jamie888 21-Apr-16 5:39am

Sir, my setting is exactly the same as your answer above.

F-ES Sitecore 21-Apr-16 5:53am

Then the code should work, as I said there is something about your set-up or project you're not telling us.

Jamie888 21-Apr-16 5:55am

Sir, I have moved my value in web config file into app config file and it works now. But one thing that I am not sure, why does value in web config file doe snot work?

F-ES Sitecore 21-Apr-16 6:09am

Because the web.config file is only used when your code is running in the context of a web site.