Encrypt Web.config file - asp.net

This is an example of how to encrypt a web.config file in asp.net.

The example will encrypt web config file for 3 section which is ConnectionString, AppSetting, and system.web/authentication.

Front End .aspx Code 

  <br />  
   This is button to encrypt web config.<br />  
 <asp:Button ID="Button1" runat="server" Text="Encrypt Web config" OnClick="Button1_Click" />  

Code Behind

  private static string[] sectionName = { "connectionStrings", "appSettings", "system.web/authentication" };  
     public static string[] SectionName  
     {  
       get  
       {  
         return sectionName;  
       }  
       set  
       {  
         sectionName = value;  
       }  
     }  
     protected void Button1_Click(object sender, EventArgs e)  
     {  
       //encrypt  
       ProtectSection();  
     }  
     /// <summary>  
     /// Encrypte WebConfig file for certain section  
     /// </summary>  
     /// <param name="sectionName"></param>  
     /// <param name="provider"></param>  
     private void ProtectSection()  
     {  
       string provider = "DataProtectionConfigurationProvider";  
       foreach (string a in SectionName)  
       {  
         Configuration config =  
           WebConfigurationManager.  
             OpenWebConfiguration("~/");  
         ConfigurationSection section =  
                config.GetSection(a);  
         if (section != null &&  
              !section.SectionInformation.IsProtected)  
         {  
           section.SectionInformation.ProtectSection(provider);  
           config.Save();  
         }  
       }  
     }  

Output