Which method is used to encrypt my connection string in app.config C#

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C#

Visual-Studio

C#5.0

My connection String is,

<connectionString value="Data Source=HEMTECH\SA;Initial Catalog=HemWizard;User ID=sa; Password=hemtech;" />

My Encrypted connection string is ( i want below output for above connection string )

<add key="DBConnString" value="RGF0YSBTb3VyY2U9SEVNVEVDSFxTQTtJbml0aWFsIENhdGFsb2c9SGVtV2l6YXJkO1VzZXIgSUQ9c2E7IFBhc3N3b3JkPWhlbXRlY2g7"/>

I can't do like above encrypted connection string so help me how to encrypt my connection string.

What I have tried:

public static void EncryptConnectionString(bool encrypt, string fileName)
{
Configuration configuration = null;
try
{
// Open the configuration file and retrieve the connectionStrings section.
configuration = ConfigurationManager.OpenExeConfiguration(fileName);
ConnectionStringsSection configSection = configuration.GetSection("connectionStrings") as ConnectionStringsSection;
if ((!(configSection.ElementInformation.IsLocked)) && (!(configSection.SectionInformation.IsLocked)))
{
if (encrypt && !configSection.SectionInformation.IsProtected)
{
//this line will encrypt the file
configSection.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
}

if (!encrypt && configSection.SectionInformation.IsProtected)//encrypt is true so encrypt
{
//this line will decrypt the file. 
configSection.SectionInformation.UnprotectSection();
}
//re-save the configuration file section
configSection.SectionInformation.ForceSave = true;
// Save the current configuration

configuration.Save();
Process.Start("notepad.exe", configuration.FilePath);
//configFile.FilePath 
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}