Windows service with download file from URL and store it in Local location

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.NET

I want to create windows service which download file from URL and store it into local path.

My code is like...


<pre>
string destPath = Environment.SystemDirectory + @"\oobe\Info\backgrounds\";
if (!Directory.Exists(destPath))
{
Directory.CreateDirectory(destPath);
}
Stream str = null;
string _URL = "http://localhost/exercise2/bin-debug/Background/backgroundDefault.jpg";
//Create a web request to the url containing the image
HttpWebRequest wReq = (HttpWebRequest)WebRequest.Create(_URL);

//gets the response from the web request
HttpWebResponse wRes = (HttpWebResponse)(wReq).GetResponse();

//return the image stream from the URL specified earlier
str = wRes.GetResponseStream();

if (str != null)
{
Image.FromStream(str).Save(destPath + "backgroundDefault.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
str.Flush();
}

</pre>

When service execute that time it gives error like
Error! A generic error occurred in GDI+.
Any Idea about creating windows service for download file in some interval time and store it in local location????

Help me....