underlying connection was closed using webclient from azure

Question

I am windows application developer currently am working in a tutorial based application.my application is built in framework 2.0,c#.net ,i have a task that i need to download zip files from azure cloud storage, i know i can simply done this using windows azure nuget package in higher framework but the problem is i can't upgrade the application framework i need to done the task with this framework. can anyone please help me how to solve this, i got a small hint and i tried on that time i got an error "underlying connection was closed". please help me my code

 string spath = Application.StartupPath.ToString();
            string lPath = spath + "\\EncryptedFiles";
            string dTo = Path.Combine(lPath, File);
            if (System.IO.File.Exists(dTo))
            {
                System.IO.File.Delete(dTo);
            }
            NetworkCredential credential = new NetworkCredential("*****", "*****");
            CredentialCache cCache = new CredentialCache();
            cCache.Add(new Uri(fileName), "Basic", credential);

            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
            ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(delegate { return true; });

            WebClient wClient = new WebClient();
            wClient.Credentials = cCache;
            wClient.DownloadFile(fileName, dTo);