Untitled

System.Net.Http.HttpClient does not contain a definitions for TransportSettings
HttpClient fond = new HttpClient();
using (var client = new HttpClient())
{
    HttpClient.TransportSettings.Credentials = new System.Net.NetworkCredential("username", "pwd");
}
var reponse = await fond.GetStreamAsync("" + TitleNewsGrid.Text);

using (var handler = new HttpClientHandler())
{
    handler.Credentials = new System.Net.NetworkCredential("username", "pwd");
    using (var client = new HttpClient(handler){  }
    {
        // code
    }
}