System.IO.IOException: The process cannot access the file 'd:\wwwroot\wfguqiang.com\QR.jpg' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at tfox.fenzhan.NGenerateSub.CreateCode_Simple(String nr, String rootPath)
   at tfox.fenzhan.NGenerateSub.BindFixData(StringBuilder sb, String rootPath, String template)
   at tfox.fenzhan.NGenerateSub.BindData(StringBuilder sb, String rootPath, String template)
   at tfox.fenzhan.NGenerateSub.GenerateFoot(String rootPath, String template)
   at tfox.fenzhan.NGenerateSub.BindFixData(StringBuilder sb, String rootPath, String template)
   at tfox.fenzhan.NGenerateSub.BindData(StringBuilder sb, String rootPath, String template)
   at tfox.fenzhan.NGenerateSub.GenerateProList(String rootPath, String template, String typeid1, String id, String city, String py, String page)