replace a file in asp.net

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C#

ASP.NET

hi experts
in my website,users can changer theirs avatar.
but when user has not a image and insert a image for first time is correct,but when there is a image and user changes it i got this error (in local is correct in the server i got error):

Quote:

System.UnauthorizedAccessException
: Access to the path 'D:\Intranet\Portal\User\Pictures\6202.jpg' is denied.

its my code:

var strPath1 = HttpContext.Current.Server.MapPath("~/User/Pictures/") + strFileName;
                                            var strPath2 = HttpContext.Current.Server.MapPath("~/Public/Pictures/") + strFileName;
                                            if (File.Exists(strPathName))
                                            {
                                                HttpContext.Current.Application.Lock();
                                                File.SetAttributes(strPathName, FileAttributes.Normal);
                                                File.Delete(strPathName);
                                                File.Delete(strPath1);
                                                File.Delete(strPath2);
                                                HttpContext.Current.Application.UnLock();
                                            }
                                            oHttpPostedFile.SaveAs(strPathName);
                                            oHttpPostedFile.SaveAs(strPath1);
                                            oHttpPostedFile.SaveAs(strPath2);

i set asp.net permission for folders in server.

Thanks in advance