A bit vague, I'll attempt a guess:
Read the data into a buffer and create a
MemoryStream
byte[] buffer;
MemoryStream stream = new MemoryStream(buffer);
Create a Bitmap from the stream
Bitmap bitmap = new Bitmap(stream);
In the form's Paint event handler, draw the image thus:
private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawImage(bitmap, x, y);
}
x and y are the coordinates of the place where you draw the image.
(look up each method in MSDN for details)