连接字符串中包含数据库的访问信息，帐号和密码，因此一般不以明文显示，本代码用来加密连接字符串。

public static class EncryptConnection { public static void EncryptConnectionString(bool encrypt) { Configuration configFile = null; try { // Open the configuration file and retrieve the connectionStrings section. configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); ConnectionStringsSection configSection = configFile.GetSection("connectionStrings") as ConnectionStringsSection; if ((!(configSection.ElementInformation.IsLocked)) && (!(configSection.SectionInformation.IsLocked))) { if (encrypt && !configSection.SectionInformation.IsProtected) //encrypt is false to unencrypt { configSection.SectionInformation.ProtectSection("DataProtectionConfigurationProvider"); } if (!encrypt && configSection.SectionInformation.IsProtected) //encrypt is true so encrypt { configSection.SectionInformation.UnprotectSection(); } //re-save the configuration file section configSection.SectionInformation.ForceSave = true; // Save the current configuration. configFile.Save(); } } catch (System.Exception ex) { throw (ex); } finally { } } }