Sending message from C# client to C server -

i'm new socket programming, but, using online tutorial, i've sent short string 1 machine using c.

the problem i'm having trying send string client written in c#. server (written in c) prints out blank/empty string.

here c code runs on "server" machine (in case router running openwrt):

int main(int argc, char *argv[]) {     int listenfd = 0, connfd = 0;     struct sockaddr_in serv_addr;      char recvbuff[1025];      int bytesread;      listenfd = socket(af_inet, sock_stream, 0);     memset(&serv_addr, '0', sizeof(serv_addr));      serv_addr.sin_family = af_inet;     serv_addr.sin_addr.s_addr = htonl(inaddr_any);     serv_addr.sin_port = htons(1234);      bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));      printf("listening string on port 1234...\n");      listen(listenfd, 10);      while(1)     {         connfd = accept(listenfd, (struct sockaddr*)null, null);          bytesread = recv(connfd, recvbuff, 1024, 0);    // receive string          if (bytesread < 0)         {             printf("error reading stream\n");         }          recvbuff[bytesread] = 0;    // null-terminate string          printf("%d:%s\n", bytesread, recvbuff);          close(connfd);         sleep(1);      } } 

when sending little server string c program works expected (prints string out waits one). [note: don't think c client's code relevant, can post if need be]

however, when trying send string c# program (copied below), server prints out 0: (i.e. 0 bytes read, followed empty string) , can't life of me figure out issue is. both apps pretty straightforward, i'm assuming should using other writeline (i've tried write no avail).

c# client:

namespace sockettest {     class program     {         static void main(string[] args)         {             tcpclient client = new tcpclient("10.45.13.220", 1234);              stream stream = client.getstream();              streamwriter writer = new streamwriter(stream);              writer.writeline("testing...");              client.close();         }     } } 

to null terminate string use

recvbuff[bytesread] = '\0';  

and call close on writer (which causes writer flush pending bytes)

writer.writeline("testing..."); writer.close(); client.close();