c# Send/Recieve Image from Stream

Question

I have currently wrote the following codes. Client and Server side. I want to send on demand an image from server to client . The image will be a screenshot from the server, so I will always be different size.

Sending the first image is a task well accomplished . But when I am sending the next the picturebox does not refresh . From debugging I can see that the bytes from server to client get through successfully . But the code seems to just receive the bytes and not continue with the rest of the code

The "commented" line for the "while" loop ( client ) seem to work in debugging, but I cannot see the result 'cause the program gets stuck in the while loop and I can't get the application's window on the foreground

I am currently testing in windows but the client is going to get adjusted to work on android

SERVER picture Client picture

SERVER

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    Socket client;
    private void button2_Click(object sender, EventArgs e)
    {
        Bitmap bmp = TakingScreenshotEx1();
        bmp.Save("1.jpeg", ImageFormat.Jpeg);

        byte[] buffer = ReadImageFile("1.jpeg");
        int v = client.Send(buffer, buffer.Length, SocketFlags.None);
        Console.WriteLine("Image SENT!");
    }

    private Bitmap TakingScreenshotEx1()
    {
        //Create a new bitmap.
        var bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                                       Screen.PrimaryScreen.Bounds.Height,
                                       PixelFormat.Format32bppArgb);

        // Create a graphics object from the bitmap.
        var g = Graphics.FromImage(bmpScreenshot);

        // Take the screenshot from the upper left corner to the right bottom corner.
        g.CopyFromScreen(Screen.PrimaryScreen.Bounds.X,
                         Screen.PrimaryScreen.Bounds.Y,
                         0,
                         0,
                         Screen.PrimaryScreen.Bounds.Size,
                         CopyPixelOperation.SourceCopy);

        return bmpScreenshot;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
        Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        server.Bind(iep);
        server.Listen(100);
        Console.WriteLine("Waiting for client....");
        client = server.Accept();
    }
    private static byte[] ReadImageFile(String img)
    {
        FileInfo fileinfo = new FileInfo(img);
        byte[] buf = new byte[fileinfo.Length];
        FileStream fs = new FileStream(img, FileMode.Open, FileAccess.Read);
        fs.Read(buf, 0, buf.Length);
        fs.Close();

        GC.ReRegisterForFinalize(fileinfo);
        GC.ReRegisterForFinalize(fs);
        return buf;
    }
}

CLIENT

public Form1()
{
    InitializeComponent();
    pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
}
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
byte[] buffer = new byte[1000000];
private void button1_Click(object sender, EventArgs e)
{  

   if(client.Connected != true)
    client.Connect(iep);


 //   while (true)
 //   {
        int v = client.Receive(buffer, buffer.Length, SocketFlags.None);

        Console.WriteLine("Data Received!");

        Stream stream = new MemoryStream(buffer);
        var img = Bitmap.FromStream(stream);
        pictureBox1.Image = img;

 //   }

}

Answer 1

As Peter Duniho pointed out the while loop is blocking the UI thread

I found a fitting solution here How to wait for thread to complete without blocking UI

Also you can check Invoking the Main Thread inside Timer Method