You can use the WebClient to download the image by feeding it the url of the php link as such:
System.Net.WebClient client = new System.Net.WebClient();
// download file
client.DownloadFile("<>.php", "<>.jpg");
// retrieve file bytes
byte[] imgBytes = client.DownloadData("<>.php");
This is good, but this downloads a second and new captcha that doesnt work with the posting. I need the exact same captcha that was generated with the form.
 
Plz reply