c# - WebClient DownloadFileAsync() does not work -

webclient downloadfileasync() not work same url , credentials...

any clue?

 static void main(string[] args)         {             try             {                 var urladdress = "http://mywebsite.com/msexceldoc.xlsx";                   using (var client = new webclient())                 {                     client.credentials = new networkcredential("username", "password");                     // works fine.                       client.downloadfile(urladdress, @"d:\1.xlsx");                 }                  /*using (var client = new webclient())                 {                    client.credentials = new networkcredential("username", "password");                      // y creats file 0 bytes. dunow why it.                      client.downloadfileasync(new uri(urladdress), @"d:\1.xlsx");                     //client.downloadfilecompleted += new asynccompletedeventhandler(completed);                  }*/             }             catch (exception ex)             {              }         } 

you need keep program running while async download completes, runs in thread.

try this, , wait completed before hit enter end program:

static void main(string[] args)     {         try         {             var urladdress = "http://mywebsite.com/msexceldoc.xlsx";              using (var client = new webclient())             {                client.credentials = new networkcredential("username", "password");                  client.downloadfileasync(new uri(urladdress), @"d:\1.xlsx");                 client.downloadfilecompleted += new asynccompletedeventhandler(completed);         }         catch (exception ex)         {          }      console.readline();     }  public static void completed(object o, asynccompletedeventargs args) {     console.writeline("completed"); } 

depending kind of app you're using in, main thread needs keep running while background thread downloads file.