How to fix warning “System.Configuraion.ConfigurationSettings.AppSettings” is obsolete in Visual Studio

Usage “Application configuration file” is very good in creating simple applications. It’s very good to store in it values like path, string for database connection or something like this. I use it for a long time. But not so long ago I have noticed that Studio highlights string where configuration file used:

[Deprecated] System.Collections.Spicialized.NameValueCollection ConfigurationSettings.AppSettings

The example of highlight is in the figure 1.

To fix it you should make next steps:

1. Add reference to System.Configuraion in your project (Figure 2).

2. Change “ConfigurationSettings” to “ConfigurationSettings”

string sourceDir = ConfigurationSettings.AppSettings[“fsdir”];

to:

string sourceDir = ConfigurationManager.AppSettings[“fsdir”];

Now no obsolete warnings about using configuration settings.