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/********************************************************************************
 * 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;
}