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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Net;
using System.IO;
using Gapi.Search;
using System.Threading;

namespace WindowsFormsApplication1
{
    class GoogleSearchePictures
    {
        private int NumThreads = 0;
        private static string[] inputArray;
        private static Image[] resultArray;
        private static ManualResetEvent[] resetEvents;


        public List<Image> GetImages(string SearcheWord, int Limit)
        {
            SearchResults googleResults = null;
            List<Image> listImage = new List<Image>();
            List<string> listUrl = new List<string>();

            for (int i = 0; i < Limit; ) // Das i++ wurde in das Innere verschoben
            {
                googleResults = Searcher.Search(SearchType.Image, SearcheWord, (i + 1) * 8);
                foreach (SearchResult item in googleResults.Items)
                {
                    listUrl.Add(item.Url);
                    i++;
                }
            }

            NumThreads = listUrl.Count;

            inputArray = new string[NumThreads];
            resultArray = new Image[NumThreads];
            resetEvents = new ManualResetEvent[NumThreads];

            for (int s = 0; s < NumThreads; s++)
            {
                inputArray[s] = listUrl[s];
                resetEvents[s] = new ManualResetEvent(false);
                ThreadPool.QueueUserWorkItem(new WaitCallback(GetImageFromURL), (object)s);
            }

            WaitHandle.WaitAll(resetEvents);

            for (int i = 0; i < resultArray.Length; i++)
            {
                listImage.Add(resultArray[i]);
            }

            return listImage;
        }

        private static void GetImageFromURL(object a)
        {

            int iIndex = (int)a;
            string strUrl = inputArray[iIndex];

            try
            {
                HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create((string)strUrl);
                HttpWebResponse httpWebReponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream stream = httpWebReponse.GetResponseStream();
                resultArray[iIndex] = Image.FromStream(stream);
            }
            catch (Exception){}

            resetEvents[iIndex].Set();
        }
    }
}					

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for (int i = 0; i < resetEvents.Length; i++)
{
  resetEvents[i].WaitOne();
}