public static string DecryptData(string data2Decrypt) { //string urlDecodeData = HttpUtility.UrlDecode(data2Decrypt); EZRSA rsa; rsa = new EZRSA(1024); rsa.FromXmlString(privateKeyString); byte[] getpassword = Convert.FromBase64String(data2Decrypt); byte[] plain = rsa.Decrypt(getpassword, false); return System.Text.Encoding.UTF8.GetString(plain); }