C # winform File Download

///   <Summary>          ///  Download file (display progress)  ///   </Summary>          ///   <Param name = "url"> </param>          ///   <Param name = "FILENAME"> </param>          ///   <Param name = "prog"> </param>          Public   Void Downloadfile (String URL, String  Filename, system. Windows. Forms. progressbar prog ){  Try  {System. net. httpwebrequest myrq = (System. net. httpwebrequest) system. net. httpwebrequest. Create (URL); system. net. httpwebresponse myrp = (System. net. httpwebresponse) myrq. getresponse ();  Long Totalbytes = Myrp. contentlength;  If (Prog! =Null  ) {Prog. Maximum = ( Int  ) Totalbytes;} system. Io. Stream St = Myrp. getresponsestream (); system. Io. stream so = New  System. Io. filestream (filename, system. Io. filemode. Create );  Long Totaldownloadedbyte = 0  ;  Byte [] By =New   Byte [ 1024  ];  Int Osize = ST. Read (, 0 ,( Int  ) By. Length );  While (Osize> 0  ) {Totaldownloadedbyte = Osize + Totaldownloadedbyte; system. Windows. Forms. application. doevents (); so. Write (, 0  , Osize );  If (Prog! = Null  ) {Prog. Value = ( Int  ) Totaldownloadedbyte;} osize = ST. Read (, 0 ,( Int  ) By. Length) ;}so. Close (); ST. Close ();}  Catch (System. Exception ){  Throw  ;}}  ///   <Summary>          ///  Download files  ///   </Summary>          ///   <Param name = "url"> </param>          ///   <Param name = "FILENAME"> </param>          Public   Void Downloadfile ( String URL, String  Filename) {downloadfile (URL, filename,  Null  );}