are there any drawbacks or risks of using Parallel.Foreach with WebClient() inside my asp.net mvc web application

Question

I am working on an asp.net MVC-5 web application, and based on some articles i read that i should not use Parallel methods inside web servers and inside .net web applications es

Answer 1

Take a look at:
object syncObj = new object();
lock(syncObj)

try
{
    using (WebClient wc = new WebClient()) 
    {
        string url = currentURL + "resources?AUTHTOKEN=" + pmtoken;
        var json = await wc.DownloadStringTaskAsync(url);
        resourcesinfo = JsonConvert.DeserializeObject(json);
    }

    object syncObj = new object();  // create sync object
    Parallel.ForEach(resourcesinfo.operation.Details, new ParallelOptions { MaxDegreeOfParallelism = 7 }, (c) =>
    {
        ResourceAccountListInfo resourceAccountListInfo = new ResourceAccountListInfo();
        using (WebClient wc = new WebClient()) 
        {
            string url = currentURL + "resources/" + c.RESOURCEID + "/accounts?AUTHTOKEN=" + pmtoken;
            string tempurl = url.Trim();

            var json =  wc.DownloadString(tempurl);
            resourceAccountListInfo = JsonConvert.DeserializeObject(json);
        }

        lock(syncObj)  // lock using sync object
        {
            PMresourcesOnly.Add(resourceAccountListInfo.operation.Details);
        }
    });//end of foreach

    return PMresourcesOnly.ToList();
}
catch (Exception e)
{
}