/// <summary>
/// Users authentication service to get auth key
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
void GetAuthenticationKey(object sender, DoWorkEventArgs args)
{
var credentials = args.Argument as Credentials;
try {
var client = new AuthServiceClient();
args.Result = client.GetAuthKey(credentials.Username, credentials.Password);
client.Close();
} catch (EndpointNotFoundException e) {
args.Result = String.Empty;
}
}