Login does not seem work

[saleem]

	public static string GetTotp(string otpKey)
	{
	var secretKey = tpNet.Base32Encoding.ToBytes(otpKey);
	var totp = new Totp(secretKey);
	//var otp = totp.ComputeTotp();
	//return otp;

	if (totp.RemainingSeconds() < 2)
	{
		Thread.Sleep(3);
	}
	return totp.ComputeTotp();
	}
	private void btnAngelOneLogin_Click(object sender, EventArgs e)
	{
		string api_key = "kpfqJYZO";
		string Client_code = "M51790325";
		string totp_qr_code_key = "4ELFQ5KYC4JL4VGNDIGPU49CJM";

		SmartApi connect = new SmartApi(api_key);
		string totp = GetTotp(totp_qr_code_key);

		OutputBaseClass obj = new OutputBaseClass();
		obj = connect.GenerateSession(Client_code, totp);

		if (obj.status == false)
		{
			string http_code = obj.http_code;
			string http_error = obj.http_error;

			string msg = string.Format("Error Logging in. HTTP Code: {0}, HTTP Error: {1}", http_code, http_error);

			MessageBox.Show(this, msg);
			return;
		}

}

How to fix this, Any help will be greatly appreciated