WebClient UploadFile Hanging Winform

Question

The Upload file randomly and I dont know why. Can someone give me some assistance on the Upload function.

 

WebClient client = new WebClient();

client.Credentials = CredentialCache.DefaultCredentials;

client.UploadFile(ipaddr, "POST", @"C:\Temp\ImageShow\White--Dot.png" );

client.Dispose();