private void okBtn_Click(object sender, EventArgs e)

        {

            this.ip = ipTB.Text;

            String port = portTB.Text;

            this.path = textBox1.Text;

            if (this.ip == "" || port == "" || this.path == "")

            {

                showLB1.Text = "ip,port和文件的输入框不能为空!";

                showLB1.Refresh();

            }

            else

            {

                this.port = int.Parse(port);

                try

                {

                lable:

                    //创建终结点EndPoint

                    IPAddress ipaddress = IPAddress.Parse(this.ip);

                    IPEndPoint ipe = new IPEndPoint(ipaddress, this.port);



                    //创建Socket并连接到服务器

                    Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);   //  创建Socket

                    showLB1.Text = "Connecting...";

                    showLB1.Refresh();