How can I do parallel processing inside foreach loop for "requestData"?

Question

I am iterating one foreach loop in which I am parsing one string like this:

I want to fire parallel request in HttpWebRequest for my string "imageUrl". Means At a time 4 request and response type of system.(For Utility of my Core).

How can I do it?

Code:

foreach (var item in requestData)
{
 try
 {
 string imageUrl = Convert.ToString(item.ImageUrl);
 imageUrl = imageUrl.Replace('\r', ' ');
 //It is Use for saving at our project location.
 string saveLocation = 
 @AppDomain.CurrentDomain.BaseDirectory + @"Image\someone.jpg";
 byte[] imageBytes;
 try
 {
 HttpWebRequest imageRequest = 
 (HttpWebRequest)WebRequest.Create(imageUrl);
 WebResponse imageResponse = imageRequest.GetResponse();
 Stream responseStream = imageResponse.GetResponseStream();
 using (BinaryReader br = new BinaryReader(responseStream))
 {
 imageBytes = br.ReadBytes(500000);
 br.Close();
 }
 responseStream.Close();
 imageResponse.Close();
 FileStream fs = null;
 BinaryWriter bw = null;
 fs = new FileStream(saveLocation, FileMode.Create);
 bw = new BinaryWriter(fs);
 bw.Write(imageBytes);
 fs.Close();
 bw.Close();
 id = Convert.ToString(item.Id);
 // string ImageUrl= Convert.ToString(dr["ImageUrl"]);
 ImageProcess(id);
 }
 catch (Exception)
 {
 log.Info("Image Url Wrong!!!");
 drCurrentRow = dt.NewRow();
 drCurrentRow["Id"] = Convert.ToString(item.Id); ;
 drCurrentRow["Label"] = "Error";
 drCurrentRow["Score"] = 0;
 drCurrentRow["Flag"] = "1";
 dt.Rows.Add(drCurrentRow);
 //drCurrentRow = dt.NewRow();
 dt.AcceptChanges();
 }
 finally
 {
 fs.Close();
 bw.Close();
 }
 }
 catch (Exception e)
 {
 log.Info(e);
 } 
}
BulkInsert();
}

I want to fire parallel request in HttpWebRequest for my string imageUrl.

How can I do it?

• Lukas Körfer: Possible duplicate of Send multiple WebRequest in Parallel.For

Answer 1

Parallel.ForEach(requestData, item =>
 {
 //your code 
 });

Answer 2

You could use Parallel.ForEach() or by Using async and await

Parallel.ForEarch(requestData, item => {
 //web request
});