var username = "{your username}";
var password = "{your password}";

username = "bo@demo";
password = "123";
var ticketHeader = api.GetPublicKey("Test", "F52D2965BF8318F", out string publicKey);
if (publicKey == null)
{
    throw new Exception("Can not get public key.");
}

RSACryptoServiceProvider key = new RSACryptoServiceProvider();
key.FromXmlString(publicKey);
UnicodeEncoding enc = new UnicodeEncoding();

byte[] encryptedPassword;

encryptedPassword = key.Encrypt(enc.GetBytes(password), false);

if (api.Login(ticketHeader, username, encryptedPassword) == false)
{
    throw new Exception("Login failed.");
}