Encrypt web.Config sections using c# in asp.net

To give secuity to to your web application you need to make your applications secured you can encrypt the certain sections of web.config . To accomplish this task microsoft has provided library in the namespace System.Web.Configuration.
To Encrypt the web.config section you can use the following code

using System.Configuration.Provider;
using System.Configuration.Assemblies;
using System.Web.Configuration;

Configuration confi =  WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
  ConfigurationSection section = confi.ConnectionStrings;
section.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");

To Decrypt the web.config section you can use the following code

using System.Configuration.Provider;
using System.Configuration.Assemblies;
using System.Web.Configuration;

Configuration confi =  WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
   ConfigurationSection section = confi.ConnectionStrings;
section.SectionInformation.UnprotectSection();

In above example I have encrypted the connectionString Section of the web.Config, similarly you can Encrypt and decrypt appsettings section of web.Config