GUID converted to 16-bit string or 19-bit unique string

Organize several common GUIDs into 16-bit strings or 19-bit unique string methods:

        //   <summary>         ///   16-bit unique string based on GUID          ///Author: Hui Yifang        //   </summary>         ///   <param name=\ "guid\" ></param>         ///   <returns></returns>          Public Static string guidto16string()        {Longi =1;foreach(byteBinchGuid.NewGuid (). Tobytearray ()) I *= ((int) B +1);return string. Format ("{0:x}", i-datetime.now.ticks); }//   <summary>         ///   19-bit unique sequence of numbers based on GUID          ///Author: Hui Yifang        //   </summary>         ///   <returns></returns>          Public Static Long Guidtolongid()        {byte[] buffer = Guid.NewGuid (). Tobytearray ();returnBitconverter.toint64 (Buffer,0); }//   <summary>         ///   generate 22-bit unique digits concurrently available          ///Author: Hui Yifang        //   </summary>         ///   <returns></returns>          Public Static string Generateuniqueid() {System.Threading.Thread.Sleep (1);//Guaranteed YYYYMMDDHHMMSSFFFF uniqueRandom d =NewRandom (Bitconverter.toint32 (GUID.NEWGUID). Tobytearray (),0));stringStrunique = DateTime.Now.ToString ("YYYYMMDDHHMMSSFFFF") + D.next ( +,9999);returnStrunique; }//   <summary>         ///   generate 22-bit unique digits concurrently available          ///Author: Hui Yifang        //   </summary>         ///   <returns></returns>          Public Static string Generateuniqueid() {System.Threading.Thread.Sleep (1);//Guaranteed YYYYMMDDHHMMSSFFFF uniqueRandom d =NewRandom (Bitconverter.toint32 (GUID.NEWGUID). Tobytearray (),0));stringStrunique = DateTime.Now.ToString ("YYYYMMDDHHMMSSFFFF") + D.next ( +,9999);returnStrunique; }

Hope that the above share of the beginner friends some help, thank you!
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GUID converted to 16-bit string or 19-bit unique string