c# - TCP File Transfer - Few bytes error -

i working on c# program allows user send file on network , reassemble @ other end. working fine apart few bytes being misplaced int destination leaving not quite same file started as. (corrupting images example). edit: @ least when it's on computer noticed error can solved having client wait 1 second before starting read stream, gives idea client gets end of stream , reads else instead. idea how fix in better way waiting second other computers don't know if that'll work. code server follows:

tcplistener listener = new tcplistener(13);         listener.start();         filestream inputstream = file.openread(loadlocation.text);//loadlocation being text box file path         fileinfo f = new fileinfo(loadlocation.text);         int size = unchecked((int)f.length);//get's file size in bytes         int  csize = size / 4096;//get's size in chunks of 4kb;             statuslabel.text = "waiting connection...";             tcpclient client = listener.accepttcpclient();             statuslabel.text = "connection accepted.";             networkstream ns = client.getstream();             byte[] bytesize = bitconverter.getbytes(size);//sends number of bytes expect on network             try             {                 ns.write(bytesize, 0, bytesize.length);                 byte[] temp = new byte[4096];                 (int = 0; < csize; i++)                 {                     inputstream.read(temp, 0, 4096);                     ns.write(temp, 0, 4096);                 }                 byte[] end = new byte[size % 4096];                 inputstream.read(end, 0, size % 4096);                 ns.write(end, 0, size % 4096);                 ns.close();                 inputstream.close();                 client.close();                 done = true;                 statuslabel.text = "done!";             }             catch (exception a)             {                 console.writeline(a.tostring());             }         listener.stop(); 

the client code follows:

try         {             filestream outputstream = file.openwrite(savelocation.text);             tcpclient client = new tcpclient("127.0.0.1", 13);              networkstream ns = client.getstream();              byte[] bytetime = new byte[sizeof(int)];             int bytesread = ns.read(bytetime, 0, sizeof(int));             int size;             size = bitconverter.toint32(bytetime, 0);             int csize = size / 4096;             byte[] temp = new byte[4096];             (int = 0; < csize; i++)             {                 ns.read(temp, 0, 4096);                 outputstream.write(temp, 0, 4096);             }             byte[] end = new byte[size % 4096];             ns.read(end, 0, size % 4096);             outputstream.write(end, 0, size % 4096);             ns.close();             outputstream.close();             client.close();             statuslabel.text = "done!";          }         catch (exception a)         {             console.writeline(a.tostring());         } 

i know tcp guarantees order of delivery , such have no idea possibly causing problem output file. other note worthy part each time, corruption different example when transferring image there large mark @ different point on image.

your code should take account, networkstream (and tcp sockets in general) not return full number of bytes requested.

microsoft writes:

the read operation reads data available, number of bytes specified size parameter.

add outer loop around read operations ensure buffer filled. more error handling advisable.

perhaps, can inspiration similar question+answer. shows how such outer loop can like.