/********************************************************************************
 * Install and reference the following libraries:
 * ----------------------------------------------
 * BouncyCastle			(NuGet)
 * HtmlAgilityPack 		(NuGet)
 * System.Globalization	(.NET Framework)
 * System.IO 			(.NET Framework)
 ********************************************************************************/
 
public static void Main(string[] args)
{
	// Generate the RSA key pair, public and private
	var keys = GenerateKeys(2048);

	// Write the public RSA key
	using(var textWriter = new StreamWriter("c:\\folder-name\\public.key"))
	{
		var writer = new Org.BouncyCastle.OpenSsl.PemWriter(textWriter);
		writer.WriteObject(keys.Public);
		writer.Writer.Flush();
	}

	// Write the private RSA key
	using(var textWriter = new StreamWriter("c:\\folder-name\\private.key"))
	{
		var writer = new Org.BouncyCastle.OpenSsl.PemWriter(textWriter);
		writer.WriteObject(keys.Private);
		writer.Writer.Flush();
	}
}

// Generates a cryptographcally strong RSA key pair.
public static AsymmetricCipherKeyPair GenerateKeys(int keySizeInBits)
{
	var r = new RsaKeyPairGenerator();
	r.Init(new KeyGenerationParameters(new SecureRandom(), keySizeInBits));
	var keys = r.GenerateKeyPair();
	return keys;
}