关于博易上传文件的一个BUG

当上传同名文件的话，就把原有的给覆盖了。。。
代码有问题
修改，\admin\Pages\Add_entry.aspx

   private void Upload(string virtualFolder, FileUpload control, string fileName)

    {

        string folder = Server.MapPath(virtualFolder);

        if (!Directory.Exists(folder))

            Directory.CreateDirectory(folder);

        int c = 0;

        string savapath = folder + fileName;

        while (File.Exists(savapath))

        {

            c++;

            savapath = folder +c+ fileName;

        }

      

            control.PostedFile.SaveAs(savapath);

       

    }