Why download image into local drive is not work from my website in asp.net mvc? I know this types of question availabel but not meet my requirement

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ASP.NET

MVC

I need to download image from a specific url. My code works properly when my site reside in Local IIS but not work when it reside in external hosting server even generate no exception. I don't know what my wrong is? If u can please suggest me.

public void DownloadFile(string source, string destination)
{
HttpWebRequest webRequest = HttpWebRequest.Create(source) as HttpWebRequest;
HttpWebResponse resp = webRequest.GetResponse() as HttpWebResponse;
if (resp.StatusCode == HttpStatusCode.OK)
{
if (resp.ContentType.Contains("image/"))
{
byte[] imageContent = ProcessImageStream(resp);
MemoryStream ms = new MemoryStream(imageContent);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
img.Save(destination);
}
}
}

public static byte[] ProcessImageStream(HttpWebResponse resp)
{
byte[] streamContent;
MemoryStream memStream = new MemoryStream();
const int BUFFER_SIZE = 4096;
int iRead = 0;
Int64 iSize = 0;
memStream.SetLength(BUFFER_SIZE);
try
{
using (memStream)
{
while (true)
{
iRead = 0;
byte[] respBuffer = new byte[BUFFER_SIZE];
iRead = resp.GetResponseStream().Read(respBuffer, 0, BUFFER_SIZE);
if (iRead == 0)
{
break;
}
iSize += iRead;
memStream.SetLength(iSize);
memStream.Write(respBuffer, 0, iRead);
}
streamContent = memStream.ToArray();
}
}
catch (Exception ex)
{
throw ex;
}
return streamContent;
}