Dear please check solution.
it is working fine i have tested.
string yourSearchingWord = "dog";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://pixplorer.co.uk/getimage/" + yourSearchingWord);
WebResponse response = request.GetResponse();
var val = new StreamReader(response.GetResponseStream()).ReadToEnd();
var ans = val.Substring(val.IndexOf("http:"));
ans = ans.Substring(0, ans.IndexOf("\""));
request=(HttpWebRequest)WebRequest.Create(ans);
response = request.GetResponse();
Image image = Image.FromStream(response.GetResponseStream());
pictureBox1.Image = image;
and thanks because of you i learn so many new things.
you can use it according to your requirements.
if any Question then let me know.
-> M.U