Encrypt connection string in Web.config

You can use server.EncryptUrl , Server.DecryptUrl Functions.

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methods for Encrypting and decrypting connectionStrings section in web.config you can use encryption configuration model " Rsa," it is feasible to change this to DataProtectionConfigurationProvider

Code
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Web; 
//specific to configuration 
using System.Configuration; 
using System.Web.Configuration; 
using System.Web.Security; 
namespace WebUtils 
{ 
/// <summary> 
/// Contains methods for Encrypting and decrypting connectionStrings
/// section in web.config 
/// current encryption configuration model is Rsa,
/// it is feasible to change this to DataProtectionConfigurationProvider 
/// </summary> 
public class EncryptDecrypt 
{ 
//Get Application path using HttpContext 
public static string path = HttpContext.Current.
Request.ApplicationPath; 
#region Encrypt method 
public static void EncryptConnString() 
{ 
Configuration config = WebConfigurationManager.
OpenWebConfiguration(path); 
ConfigurationSection section =
config.GetSection("connectionStrings"); 
if (!section.SectionInformation.IsProtected) 
{ 
section.SectionInformation.ProtectSection
("RsaProtectedConfigurationProvider"); 
config.Save(); 
} 
} #endregi
#region Decrypt method 
public static void DecryptConnString() 
{ 
Configuration config = WebConfigurationManager.
OpenWebConfiguration(path); 
ConfigurationSection section =
config.GetSection("connectionStrings"); 
if (section.SectionInformation.IsProtected) 
{ 
section.SectionInformation.UnprotectSection(); 
config.Save(); 
} 
} 
#endregion 
} 
}