How to delete uploaded images from Temp folder when user is logout using global.asax in asp.net

Question

How to delete uploaded images from Temp folder when user is logout using global.asax in asp.net

my global.asax.cs code please help me 

protected void Session_End(object sender, EventArgs e) {

string uId = Membership.GetUser(User.Identity.Name).ProviderUserKey.ToString();

string path;

string[] filename;

path = System.Web.HttpContext.Current.Server.MapPath(@"\Images");

filename = Directory.GetFiles(uId + "_" + path[path.Length - 1]);

for (int i = 0; i < filename.Length; i++) {

if (Session.SessionID == Path.GetFileName(filename[i])) {

string imgpath = filename[i];

FileInfo filepath = new FileInfo(imgpath);

if (filepath.Exists) {

File.Delete(Server.MapPath("~/temp/" + filepath.FullName));

Session.Abandon();

}

}

}

}