FileSendClient :

Form1.cs

using System;

using System.IO;

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Windows.Forms;

namespace FileSendClient

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            FileDialog fDg = new OpenFileDialog();

            if (fDg.ShowDialog() == DialogResult.OK)

            {

                FTClientCode.SendFile(fDg.FileName);

            }

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

            label3.Text = FTClientCode.curMsg;

        }

    }

    //FILE TRANSFER USING C#.NET SOCKET - CLIENT

    class FTClientCode

    {

        public static string curMsg = "Idle";

        public static void SendFile(string fileName)

        {

            try

            {

               // IPAddress ipAddress = Dns.GetHostEntry("109.52.62.59").AddressList[0];

                IPAddress ipAddress2 = Dns.GetHostAddresses("109.52.62.59")[];

                IPEndPoint ipEnd = new IPEndPoint(ipAddress2, );

                Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

                string filePath = "";

                fileName = fileName.Replace("\\", "/");

                while (fileName.IndexOf("/") > -)

                {

                    filePath += fileName.Substring(, fileName.IndexOf("/") + );

                    fileName = fileName.Substring(fileName.IndexOf("/") + );

                }

                byte[] fileNameByte = Encoding.ASCII.GetBytes(fileName);

                if (fileNameByte.Length >  * )

                {

                    curMsg = "File size is more than 850kb, please try with small file.";

                    return;

                }

                curMsg = "Buffering ...";

                byte[] fileData = File.ReadAllBytes(filePath + fileName);

                byte[] clientData = new byte[ + fileNameByte.Length + fileData.Length];

                byte[] fileNameLen = BitConverter.GetBytes(fileNameByte.Length);

                fileNameLen.CopyTo(clientData, );

                fileNameByte.CopyTo(clientData, );

                fileData.CopyTo(clientData,  + fileNameByte.Length);

                curMsg = "Connection to server ...";

                clientSock.Connect(ipEnd);

                curMsg = "File sending...";

                clientSock.Send(clientData);

                curMsg = "Disconnecting...";

                clientSock.Close();

                curMsg = "File transferred.";

            }

            catch (Exception ex)

            {

                if (ex.Message == "No connection could be made because the target machine actively refused it")

                    curMsg = "File Sending fail. Because server not running.";

                else

                    curMsg = "File Sending fail." + ex.Message;

            }

        }

        public static IPAddress GetLocalIP()

        {

            IPAddress[] addressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;

            foreach (IPAddress ipAddress in addressList)

            {

                if (ipAddress.AddressFamily == AddressFamily.InterNetwork)

                    return ipAddress;

            }

            return addressList[];

        }

    }

}

Form1.Designer.cs

namespace FileSendClient

{

    partial class Form1

    {

        /// <summary>

        /// Required designer variable.

        /// </summary>

        private System.ComponentModel.IContainer components = null;

        /// <summary>

        /// Clean up any resources being used.

        /// </summary>

        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

        #region Windows Form Designer generated code

        /// <summary>

        /// Required method for Designer support - do not modify

        /// the contents of this method with the code editor.

        /// </summary>

        private void InitializeComponent()

        {

            this.components = new System.ComponentModel.Container();

            this.button1 = new System.Windows.Forms.Button();

            this.label1 = new System.Windows.Forms.Label();

            this.label2 = new System.Windows.Forms.Label();

            this.label3 = new System.Windows.Forms.Label();

            this.timer1 = new System.Windows.Forms.Timer(this.components);

            this.SuspendLayout();

            //

            // button1

            //

            this.button1.Location = new System.Drawing.Point(, );

            this.button1.Name = "button1";

            this.button1.Size = new System.Drawing.Size(, );

            this.button1.TabIndex = ;

            this.button1.Text = "Select File to Send";

            this.button1.UseVisualStyleBackColor = true;

            this.button1.Click += new System.EventHandler(this.button1_Click);

            //

            // label1

            //

            this.label1.AutoSize = true;

            this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)()));

            this.label1.ForeColor = System.Drawing.Color.Green;

            this.label1.Location = new System.Drawing.Point(, );

            this.label1.Name = "label1";

            this.label1.Size = new System.Drawing.Size(, );

            this.label1.TabIndex = ;

            this.label1.Text = "That program can transfer small file. I\'ve test up to 1.5MB file";

            //

            // label2

            //

            this.label2.AutoSize = true;

            this.label2.Location = new System.Drawing.Point(, );

            this.label2.Name = "label2";

            this.label2.Size = new System.Drawing.Size(, );

            this.label2.TabIndex = ;

            this.label2.Text = "Present Status:";

            //

            // label3

            //

            this.label3.AutoSize = true;

            this.label3.Location = new System.Drawing.Point(, );

            this.label3.Name = "label3";

            this.label3.Size = new System.Drawing.Size(, );

            this.label3.TabIndex = ;

            this.label3.Text = "Idle";

            //

            // timer1

            //

            this.timer1.Enabled = true;

            this.timer1.Interval = ;

            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);

            //

            // Form1

            //

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(, );

            this.Controls.Add(this.label3);

            this.Controls.Add(this.label2);

            this.Controls.Add(this.label1);

            this.Controls.Add(this.button1);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.Label label1;

        private System.Windows.Forms.Label label2;

        private System.Windows.Forms.Label label3;

        private System.Windows.Forms.Timer timer1;

    }

}

FileSendServer

Form1.cs

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.IO;

using System.IO.Compression;

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Windows.Forms;

namespace FileSendServer

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            FTServerCode.receivedPath = "";

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if (FTServerCode.receivedPath.Length > )

                backgroundWorker1.RunWorkerAsync();

            else

                MessageBox.Show("Please select file receiving path");

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

            label5.Text = FTServerCode.receivedPath;

            label3.Text = FTServerCode.curMsg;

        }

        FTServerCode obj = new FTServerCode();

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

        {

            obj.StartServer();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            FolderBrowserDialog fd = new FolderBrowserDialog();

            if (fd.ShowDialog() == DialogResult.OK)

            {

                FTServerCode.receivedPath = fd.SelectedPath;

            }

        }

    }

    //FILE TRANSFER USING C#.NET SOCKET - SERVER

    class FTServerCode

    {

        IPEndPoint ipEnd;

        Socket sock;

        public FTServerCode()

        {

            ipEnd = new IPEndPoint(IPAddress.Any, );

            sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

            sock.Bind(ipEnd);

        }

        public static string receivedPath;

        public static string curMsg = "Stopped";

        public void StartServer()

        {

            try

            {

                curMsg = "Starting...";

                sock.Listen();

                curMsg = "Running and waiting to receive file.";

                Socket clientSock = sock.Accept();

                byte[] clientData = new byte[ * ];

                int receivedBytesLen = clientSock.Receive(clientData);

                curMsg = "Receiving data...";

                int fileNameLen = BitConverter.ToInt32(clientData, );

                string fileName = Encoding.ASCII.GetString(clientData, , fileNameLen);

                BinaryWriter bWrite = new BinaryWriter(File.Open(receivedPath + "/" + fileName, FileMode.Append)); ;

                bWrite.Write(clientData,  + fileNameLen, receivedBytesLen -  - fileNameLen);

                curMsg = "Saving file...";

                bWrite.Close();

                clientSock.Close();

                curMsg = "Reeived & Saved file; Server Stopped.";

            }

            catch (Exception ex)

            {

                curMsg = "File Receving error.";

            }

        }

    }

}

Form1.Designer.cs

namespace FileSendServer

{

    partial class Form1

    {

        /// <summary>

        /// Required designer variable.

        /// </summary>

        private System.ComponentModel.IContainer components = null;

        /// <summary>

        /// Clean up any resources being used.

        /// </summary>

        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

        #region Windows Form Designer generated code

        /// <summary>

        /// Required method for Designer support - do not modify

        /// the contents of this method with the code editor.

        /// </summary>

        private void InitializeComponent()

        {

            this.components = new System.ComponentModel.Container();

            this.button1 = new System.Windows.Forms.Button();

            this.label2 = new System.Windows.Forms.Label();

            this.label3 = new System.Windows.Forms.Label();

            this.label4 = new System.Windows.Forms.Label();

            this.timer1 = new System.Windows.Forms.Timer(this.components);

            this.backgroundWorker1 = new System.ComponentModel.BackgroundWorker();

            this.button2 = new System.Windows.Forms.Button();

            this.label5 = new System.Windows.Forms.Label();

            this.label6 = new System.Windows.Forms.Label();

            this.SuspendLayout();

            //

            // button1

            //

            this.button1.Location = new System.Drawing.Point(, );

            this.button1.Name = "button1";

            this.button1.Size = new System.Drawing.Size(, );

            this.button1.TabIndex = ;

            this.button1.Text = "Start Server";

            this.button1.UseVisualStyleBackColor = true;

            this.button1.Click += new System.EventHandler(this.button1_Click);

            //

            // label2

            //

            this.label2.AutoSize = true;

            this.label2.Location = new System.Drawing.Point(, );

            this.label2.Name = "label2";

            this.label2.Size = new System.Drawing.Size(, );

            this.label2.TabIndex = ;

            this.label2.Text = "Server Status:";

            //

            // label3

            //

            this.label3.AutoSize = true;

            this.label3.Location = new System.Drawing.Point(, );

            this.label3.Name = "label3";

            this.label3.Size = new System.Drawing.Size(, );

            this.label3.TabIndex = ;

            this.label3.Text = "Stopped";

            //

            // label4

            //

            this.label4.AutoSize = true;

            this.label4.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)()));

            this.label4.ForeColor = System.Drawing.Color.ForestGreen;

            this.label4.Location = new System.Drawing.Point(, );

            this.label4.Name = "label4";

            this.label4.Size = new System.Drawing.Size(, );

            this.label4.TabIndex = ;

            this.label4.Text = "That program can transfer small file. I\'ve test up to 1.5MB file";

            //

            // timer1

            //

            this.timer1.Enabled = true;

            this.timer1.Interval = ;

            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);

            //

            // backgroundWorker1

            //

            this.backgroundWorker1.DoWork += new System.ComponentModel.DoWorkEventHandler(this.backgroundWorker1_DoWork);

            //

            // button2

            //

            this.button2.Location = new System.Drawing.Point(, );

            this.button2.Name = "button2";

            this.button2.Size = new System.Drawing.Size(, );

            this.button2.TabIndex = ;

            this.button2.Text = "Select Receiving Path";

            this.button2.UseVisualStyleBackColor = true;

            this.button2.Click += new System.EventHandler(this.button2_Click);

            //

            // label5

            //

            this.label5.AutoSize = true;

            this.label5.Location = new System.Drawing.Point(, );

            this.label5.Name = "label5";

            this.label5.Size = new System.Drawing.Size(, );

            this.label5.TabIndex = ;

            this.label5.Text = "   ";

            //

            // label6

            //

            this.label6.AutoSize = true;

            this.label6.Location = new System.Drawing.Point(, );

            this.label6.Name = "label6";

            this.label6.Size = new System.Drawing.Size(, );

            this.label6.TabIndex = ;

            this.label6.Text = "File receiving path:";

            //

            // Form1

            //

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(, );

            this.Controls.Add(this.label5);

            this.Controls.Add(this.label6);

            this.Controls.Add(this.button2);

            this.Controls.Add(this.label4);

            this.Controls.Add(this.label3);

            this.Controls.Add(this.label2);

            this.Controls.Add(this.button1);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.Label label2;

        private System.Windows.Forms.Label label3;

        private System.Windows.Forms.Label label4;

        private System.Windows.Forms.Timer timer1;

        private System.ComponentModel.BackgroundWorker backgroundWorker1;

        private System.Windows.Forms.Button button2;

        private System.Windows.Forms.Label label5;

        private System.Windows.Forms.Label label6;

    }

}

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