How To Fix Additional non-parsable characters are at the end

Question

public void pushMessage(CMSMobApp obj)

{

var senderId = obj.DeviceID;//DeviceID

string message = "You have one new notification";

string title = obj.Title;

string icon = "myicon";

int ModuleId = obj.Module_id;

int Notifid = obj.Notifid;

string deviceId = obj.RegToken;//RegToken

int port = 2195;

String hostname = "gateway.push.apple.com";

String certificatePath = System.Web.Hosting.HostingEnvironment.MapPath("~/MPEDA_Sandbox_Certificates.p12");

X509Certificate2 clientCertificate = new X509Certificate2(System.IO.File.ReadAllBytes(certificatePath), "xxxxxx");

X509Certificate2Collection certificatesCollection = new X509Certificate2Collection(clientCertificate);

TcpClient client = new TcpClient(hostname, port);

SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null);

try

{

sslStream.AuthenticateAsClient(hostname, certificatesCollection, SslProtocols.Tls, false);

MemoryStream memoryStream = new MemoryStream();

BinaryWriter writer = new BinaryWriter(memoryStream);

writer.Write((byte)0);

writer.Write((byte)0);

writer.Write((byte)32);

writer.Write(HexStringToByteArray(senderId,message,title,icon,ModuleId,Notifid,deviceId.ToUpper()));

String payload = "{\"aps\":{\"alert\":\"" + "Hi,, This Is a Sample Push Notification For IPhone.." + "\",\"badge\":1,\"sound\":\"default\"}}";

writer.Write((byte)0);

writer.Write((byte)payload.Length);

byte[] b1 = System.Text.Encoding.UTF8.GetBytes(payload);

writer.Write(b1);

writer.Flush();

byte[] array = memoryStream.ToArray();

sslStream.Write(array);

sslStream.Flush();

client.Close();

}

catch (System.Security.Authentication.AuthenticationException ex)

{

client.Close();

}

catch (Exception e)

{

client.Close();

}

}

private static byte[] HexStringToByteArray(string senderId,string message,string title,string icon,int ModuleId,int Notifid,string hex)

{

return Enumerable.Range(0, hex.Length)  // getting Exception From this Line

.Where(x => x % 2 == 0)

.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))

.ToArray();

}

public static bool ValidateServerCertificate(

object sender,

X509Certificate certificate,

X509Chain chain,

SslPolicyErrors sslPolicyErrors)

{

if (sslPolicyErrors == SslPolicyErrors.None)

return true;

Console.WriteLine("Certificate error: {0}", sslPolicyErrors);

// Do not allow this client to communicate with unauthenticated servers.

return false;

}

 

Above i Mention my Code for IOS Push Notification and I getting Error where i Cooment on Line so Please Help me How to Fix this Error