如何从codebehind加密web.config中写入的connectionstring?

检查这些URL-使用aspnet\u regiis.exe http://msdn.microsoft.com/en-us/library/zhhddkxy.aspx

http://msdn.microsoft.com/en-us/library/system.configuration.sectioninformation.protectsection.aspx

试试这个

private void ProtectSection(string sectionName,
                                   string provider)
    {
        Configuration config =
            WebConfigurationManager.
                OpenWebConfiguration(Request.ApplicationPath);

        ConfigurationSection section =
                     config.GetSection(sectionName);

        if (section != null &&
                  !section.SectionInformation.IsProtected)
        {
            section.SectionInformation.ProtectSection(provider);
            config.Save();
        }
    }