ConfigurationManager.AppSettings[key] is always null

Question

I am trying to get the value for the key "sUser" in appSetting section from app.config

this is the code on my class.cs

string sUsr = ConfigurationManager.AppSettings.Get["sUser"];

But always its null.

I try this code (I took it from MSDN):

// Get the configuration file.
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

// Get the appSettings section.
AppSettingsSection appSettings = (AppSettingsSection)config.GetSection("appSettings");

// Get the auxiliary file name.
Console.WriteLine("Auxiliary file: {0}", config.AppSettings.File);

But it shows that the file Empty

Also I am using the stting console to write those properties and it works if I get the apps using

string sUsr = WIW.Business.Properties.Settings.Default.sUser;

But I am going to use that class as a reference in a website and on the web.config of the site I can't configure those settings

Answer 1

In your App.config the appSettings section should look like the following:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="sUser" value="Test"/>
  </appSettings>
</configuration>

Answer 2

use Properties.Settings.Default.{your_setting_key} to access the value

I.E

Properties.Settings.Default.sPassword return 8909039388

All these were included in Properties Class.