Question

Hello I’m trying to upload a file to my web server via c# and I’m having a problem when uploading the file my application freezes until file is done uploading and I wanted to upload it Async but I cannot seem to get the code to work here is there code and the error I keep getting.

This code works but freezes the form.

WebClient wc = new WebClient();
wc.Credentials = new System.Net.NetworkCredential(TxtUsername.Text, TxtPassword.Text);
string Filename = TxtFilename.Text;
string Server = TxtServer.Text + SafeFileName.Text;
wc.UploadFile(Server, Filename);

But if i do this code I get an error.

WebClient wc = new WebClient();
wc.Credentials = new System.Net.NetworkCredential(TxtUsername.Text, TxtPassword.Text);
string Filename = TxtFilename.Text;
string Server = TxtServer.Text + SafeFileName.Text;
wc.UploadFileAsync(Server, Filename);

and I get this error when trying to make it Async

Error 1 The best overloaded method match for System.Net.WebClient.UploadFileAsync(System.Uri, string)' has some invalid arguments.
Error 2 Argument 1: cannot convert from 'string' to 'System.Uri'

Answer 1

Change the line

wc.UploadFileAsync(Server, Filename);

to

wc.UploadFileAsync(new Uri(Server), Filename);

UploadFileAsync does not take a string argument, so you need to create a Uri from the server address. See the MSDN Docs for more details.