C# Update bitmap in picturebox

Question

I\'m working on a screen sharing project ,and i recieve a small blocks of image from a Socket constantly and need to update them on a certain initial dekstop bitmap

Answer 1

If you just need to draw on top of the canvas, you can draw the initial image just once and then use CreateGraphics() and DrawImage to update the content:

ReadData();
initial = bufferToJpeg();
pictureBox1.Image = initial;
var graphics = pictureBox1.CreateGraphics();
while (true)
{
    int pos = ReadData();
    Bitmap block = bufferToJpeg();
    graphics.DrawImage(block, BlockX(), BlockY());
}

I'll update the answer with a performance comparison as I'm not convinced this will give any major benefit; it will, at least, avoid a double DrawImage though.