Custom Network Manager

Hello everybody!

Today I tried to write the my own network manager. I start writing on sockets(TcpListener, TcpClient). Here is my code :

 using UnityEngine;
 using UnityEngine.Networking;
 using System.Collections;
 using System.Collections.Generic;
 
 //Network Usings
 using System.IO;
 using System.Net.Sockets;
 using System.Net;
 using System;
 
 namespace Mixintell.Networking
 {
     [AddComponentMenu("Networking/Network Manager")]
     public class MySocketServer : MonoBehaviour
     {
 
         public int port;
 
         private TcpListener serverSocket;
         private int requestCount = 0;
         private TcpClient clientSocket;
 
         public void StartServer()
         {
             serverSocket = new TcpListener(port);
             clientSocket = default(TcpClient);
             serverSocket.Start ();
             Debug.Log ("ServerLog[ Type : Info ] : Server Started successfully!");
             clientSocket = serverSocket.AcceptTcpClient ();
             requestCount = 0;
 
             while ((true)) {
                     requestCount = requestCount + 1;
                     NetworkStream networkStream = clientSocket.GetStream ();
                     byte[] bytesFrom = new byte[10025];
                     networkStream.Read (bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                     string dataFromClient = System.Text.Encoding.ASCII.GetString (bytesFrom);
                     Debug.Log ("ServerLog[ Type : ClientMessage ] : " + dataFromClient);
             }
         
 
             clientSocket.Close ();
             serverSocket.Stop ();
             Debug.Log ("ServerLog[ Type : Info ] : Server Stopped successfully!");
             Debug.Log ("ServerLog[ Type : Info ] : Exitting...");
             Debug.Log ("ServerLog[ Type : Info ] : ShutDown!");
 
         }
 
         public string GetIpAddress()
         {
             return Network.player.ipAddress;
         }
 
     }
 }

But if I tried to start it with function named StartServer Unity crashes and not responde. What I doing wrong?

P.S. Sorry for my english, because my Mother Language is Russian.