웹 파일 유무 체크

public static bool WebExists(string url)

{

bool ret = true;

if (url == null)

return false;

HttpWebResponse response = null;

try

{

var request = (HttpWebRequest)WebRequest.Create(url);

request.Method = "HEAD";

response = (HttpWebResponse)request.GetResponse();

}

catch (WebException)

{

ret = false;

}

finally

{

if (response != null)

{

response.Close();

}

}

return ret;

}