شروع:

using System.Xml.XPath;

private const string LINK =

    "http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query={0} movie&results=1";

public static string FindMoviePoster(string title)

{

    string url = string.Format(LINK, HttpUtility.UrlEncode(title));

    XPathDocument xd = new XPathDocument(url);

    XPathNavigator navigator = xd.CreateNavigator();

    navigator.MoveToFollowing(XPathNodeType.Element);

    navigator.MoveToFirstChild();

    navigator.MoveToFirstChild();

    do

    {

        if (navigator.LocalName == "Url")

        {

            navigator.MoveToFirstChild();

            return navigator.Value;

        }

    } while (navigator.MoveToNext());

    return null;

}

string imageUrl=FindMoviePoster("Gladiator");

if (!string.IsNullOrEmpty(imageUrl))

{

    Image1.ImageUrl = imageUrl;

}

public static string FindMovieThumbnail(string title)

{

    string url = string.Format(LINK, HttpUtility.UrlEncode(title));

    XPathDocument xd = new XPathDocument(url);

    XPathNavigator navigator = xd.CreateNavigator();

    navigator.MoveToFollowing(XPathNodeType.Element);

    navigator.MoveToFirstChild();

    navigator.MoveToFirstChild();

    do

    {

        if (navigator.LocalName == "Thumbnail")

        {

            navigator.MoveToFirstChild();

            return navigator.Value;

        }

    } while (navigator.MoveToNext());

    return null;

}