Ftp Uploading using System.net.webclient

 public void UploadFile(string FilePath, string Address)
 {
     using (System.Net.WebClient client = new System.Net.WebClient())
     {
         Uri Check = new Uri(Address + new FileInfo(FilePath).Name);

         client.UploadFileCompleted += new System.Net.UploadFileCompletedEventHandler(client_UploadFileCompleted);
         client.UploadProgressChanged += new System.Net.UploadProgressChangedEventHandler(client_UploadProgressChanged);
         client.Credentials = new System.Net.NetworkCredential("your ftp id", "your ftp password");

         //client.UploadFile(Address + new FileInfo(FilePath).Name, "STOR", FilePath);
         client.UploadFileAsync(Check, "STOR", FilePath);
     }


 }

Above is the method I am using to upload images to my ftp server, when i use this code in a console project in c# everything works perfectly fine but when I am trying to use this code in unity4.2.2 file do gets uploaded but it cant be opened it gets corrupted or something file size for uploaded file and local file are same, can anyone please help me with this issue thank you