how to post string to URL in UWP

You can upload a file with the HttpClient (which replaces the WebClient in UWP)


private async Task<string> UploadImage(byte[] file, Uri url)
    using (var client = new HttpClient())
        MultipartFormDataContent form = new MultipartFormDataContent();
        var content = new StreamContent(new MemoryStream(file));
        form.Add(content, "postname", "filename.jpg");
        var response = await client.PostAsync(url, form);
        return await response.Content.ReadAsStringAsync();

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