HttpClient - System.NullReferenceException: Object reference not set to an instance of an object.

Question

Hi, I am trying to get string from init.php, but I am getting this error while getting response.

Please help!

C#

private HttpClient httpClient;

		public void BlankPage()
		{
			this.InitializeComponent();
			httpClient = new HttpClient();
			// Limit the max buffer size for the response so we don't get overwhelmed
			httpClient.MaxResponseContentBufferSize = 256000;
			httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
		}
        public MainPage()
        {
            this.InitializeComponent();
			
		}
		
		 private async void Start_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                string responseBodyAsText;
                OutputView.Text = "";
                StatusText.Text = "Waiting for response ...";

                HttpResponseMessage response = await httpClient.GetAsync("http://melihsimsek.com/server/init.php");
                response.EnsureSuccessStatusCode();

                StatusText.Text = response.StatusCode + " " + response.ReasonPhrase + Environment.NewLine;
                responseBodyAsText = await response.Content.ReadAsStringAsync();
                responseBodyAsText = responseBodyAsText.Replace("<br>", Environment.NewLine); // Insert new lines
                OutputView.Text = responseBodyAsText;
            }
            catch (HttpRequestException hre)
            {
                StatusText.Text = hre.ToString();
            }
            catch (Exception ex)
            {
                // For debugging
                StatusText.Text = ex.ToString();
            }
        }

PHP Side

<?php
echo "asd";
?>

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Melih Şimşek / Bilkent University