Downloading JSON through WebClient

Question

I'm trying to download a JSON from Twitter with all the authorization and stuff.

WebClient wc = new WebClient();
wc.DownloadStringCompleted += (b, a) => {
    if (a.Cancelled)
        MessageBox.Show("Download Canceled!");
    else if (a.Error != null)
        MessageBox.Show("Download Error!");
    else
        string g = a.Result;
};
wc.DownloadStringAsync(new Uri("TWITTER_JSON"));

(TWITTER_JSON is a long address with many authorization headers that gives the JSON)
When I run this the 2nd message ("Download Error!") shows up. Why? And how do I fix this?

Answer 1

a.Error is actually an Exception object. Have you tried examining it to see what the exception details contain?

MessageBox.Show( a.Error.ToString() );

That will give you more information about what actually went wrong.

You may also find it helpful to read Eric Lippert's recent blog post on how to debug your code.