I am using vs 2012(4.5) i use Encryption to Encrypt my ConnectionString,but when i call to
  connStr = ConfigurationManager.ConnectionStrings["SnOracle"].ConnectionString;
i get this error object is not set to an instance of an object
I getting path to  MyApp.exe.Config   file that dont have  ConnectionStringsSection
,but Encrypted  MyApp.exe.Config.config DO have  ConnectionStringsSection.Meybe i need to set path to 
MyApp.exe.Config.config by my self or  AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; need to return path to Encrypted  file ?
How can i read ConnectionStringsSection from Encrypted MyApp.exe.Config.config file?
What i am doing wrong?
My code:
    string path = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
// This return path to-> MyApp.exe.Config   file that dont have  ConnectionStringsSection
//But Encrypted  MyApp.exe.Config.config DO have  ConnectionStringsSection
  Configuration config = ConfigurationManager.OpenExeConfiguration(path);
        ConnectionStringsSection section = config.GetSection("connectionStrings") as ConnectionStringsSection;
                if (!section.SectionInformation.IsProtected)
                {
                    // Encrypt the section.
                    section.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
                }
                step = "9";
                // Remove encryption.
                // section.SectionInformation.UnprotectSection();
                // Save the current configuration.
                config.Save();
                step = "9a";
                string connStr = "";
                try
                {
                     //here i getting the error
                    connStr = ConfigurationManager.ConnectionStrings["SnOracle"].ConnectionString;
                }
                catch (Exception ex)
                {
                    //here afert it fails i insert it hard coded
                    connStr = "Data Source=xxx;User Id=xxx;Password=xxx";
                }
MyApp.exe.Config:
<?xml version="1.0"?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
  </startup>
  <appSettings>
  </appSettings>
</configuration>
MyApp.exe.Config.config:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <connectionStrings configProtectionProvider="DataProtectionConfigurationProvider">
        <EncryptedData>
            <CipherData>
                <CipherValue>AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAffcYl/Mg5kKs24jULobCqAQAAAACAAAAAAADZgAAwAAAABAAAADYu948udrIvfvh5iP1Atz/AAAAAASAAACgfgLks14VfblBt3TX0E5ZnkwAAAASK+Jz3H9lx7DWVEQGXVS2HhqURpMbgFenk6v/lO6lMOk7Gv+tEhEmLs/zNApOaYNFAAAAJ1UfmT1bhg4zzVFv9/RcjNKjRzL</CipherValue>
            </CipherData>
        </EncryptedData>
    </connectionStrings>
</configuration>
