IMAP Response limited size - buffer

Question

I am working on an email client that will connect to Gmail mailbox and retrieve a specific email.
Now i can connect to my mailbox and can retrieve part of the emails not all of it and no matter how large is my buffer still i get only 1400 char from my email and then Null for the rest of the mail body.
You can find a screen shot for the email body in this link
http://www.elzouhery.com/Mail%20Snapshot.png
Thanks in Advance
EDIT
See below the Full Code
static void Main(string[] args)
{
TcpIMAP imap = ConnectToEmail();
Console.WriteLine("Total Messages " + imap.MailCount());
Console.WriteLine("Total Unread Messages " + imap.MailUnreadCount());
Console.WriteLine("******************************************************");
imap.SelectInbox();
StreamWriter writer = null;
int mailCount = imap.MailCount();
var mailSize = string.Empty;
var content = string.Empty;
var subject = string.Empty;
for (int i = 1; i < mailCount; i++)
{
try
{
writer = new StreamWriter(#"c:\Mails\" + i + ".txt", true);
content = imap.GetMessage(i).ToString();
writer.Write(content);
writer.Close();
}
catch(Exception ex)
{
writer.Write(content);
Console.Write(ex.Message);
writer.Close();
}
}
}
private static TcpIMAP ConnectToEmail()
{
string host = "imap.gmail.com";
string username = "************";
string password = "************";
TcpIMAP imap = new TcpIMAP();
imap.Connect(host, 993);
imap.AuthenticateUser(username, password);
return imap;
}
public static string GetMailSubject(string Header)
{
var headerLines = Header.Split(Environment.NewLine.ToCharArray());
foreach (var line in headerLines)
{
if (line.IndexOf("Subject") > -1)
{
return line.Replace("Subject: ", "");
}
}
return "";
}
/***************************************************/
class TcpIMAP
{
private TcpClient _imapClient;
private Stream _imapNs;
private StreamWriter _imapSw;
private StreamReader _imapSr;
public TcpIMAP()
{
}
public TcpIMAP(string hostname, int port)
{
InitializeConnection(hostname, port);
}
public void Connect(string hostname, int port)
{
InitializeConnection(hostname, port);
}
private void InitializeConnection(string hostname, int port)
{
try
{
_imapClient = new TcpClient(hostname, port);
System.Net.Security.SslStream sslstream = new System.Net.Security.SslStream(_imapClient.GetStream());
sslstream.AuthenticateAsClient("imap.gmail.com");
_imapNs = sslstream;
_imapSw = new StreamWriter(_imapNs);
_imapSr = new StreamReader(_imapNs);
Console.WriteLine("*** Connected ***");
Response();
}
catch (SocketException ex)
{
Console.WriteLine(ex.Message);
}
}
public void AuthenticateUser(string username, string password)
{
_imapSw.WriteLine("$ LOGIN " + username + " " + password);
_imapSw.Flush();
Response();
}
public int MailCount()
{
_imapSw.WriteLine("$ STATUS INBOX (messages)");
_imapSw.Flush();
string res = Response();
Match m = Regex.Match(res, "[0-9]*[0-9]");
return Convert.ToInt32(m.ToString());
}
public int MailUnreadCount()
{
_imapSw.WriteLine("$ STATUS INBOX (unseen)");
_imapSw.Flush();
string res = Response();
Match m = Regex.Match(res, "[0-9]*[0-9]");
return Convert.ToInt32(m.ToString());
}
public string SelectInbox()
{
_imapSw.WriteLine("$ SELECT INBOX");
_imapSw.Flush();
return Response();
}
public object GetMessageHeaders(int index)
{
_imapSw.WriteLine("$ FETCH " + index + " (body[header.fields (from subject date)])");
_imapSw.Flush();
return Response();
}
public object GetMessage(int index)
{
_imapSw.WriteLine("$ FETCH " + index + " BODY.PEEK[]");
_imapSw.Flush();
return Response();
}
private string Response()
{
byte[] data = new byte[_imapClient.ReceiveBufferSize];
int ret = _imapNs.Read(data, 0, data.Length);
string output = Encoding.ASCII.GetString(data).TrimEnd().Replace("\0", "");
return output;
}
public void Disconnect()
{
_imapSw.WriteLine("$ LOGOUT");
_imapSw.Flush();
_imapClient.Close();
}
public string SendCommand(string command)
{
_imapSw.WriteLine("$ " + command);
_imapSw.Flush();
return Response();
}

Answer 1

It looks like you are using code from here, or similar:
http://www.codeproject.com/Articles/29594/How-to-Access-Emails-Using-the-IMAP-Protocol
That code as written is wrong and won't work for larger messages. The Response() call needs to loop over calls to .Read(), appending the results until the method returns 0 (which indicates there is no more data available.) Look at the documentation for NetworkStream.Read.
Also, you'd be much better off using an IMAP library (see Accessing Imap in C#).

Answer 2

You Just Have To Change Your Receive Buffer Size