C# with yahoo weather api

Question

My intention is to develop a C# form application that retrieves weather data from yahoo weather api. I need the program to get weather data from yahoo and retrieves in the respective text input. The code is as follows..

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml.Linq;
using System.Xml;
using System.IO;
using System.Web;
using System.Speech.Recognition;
using System.Speech.Synthesis;

namespace weather
{
    public partial class Form1 : Form
    {
        string Temperature;
        string Condition;
        string Humidity;
        string WindSpeed;
        string Town;
        string TFCond;
        string TFHigh;
        string TFLow;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void GetWeather()
        {
            string query = String.Format("http://weather.yahooapis.com/forecastrss?w=1319153");
            //string query = String.Format("http://weather.yahooapis.com/forecastrss?w=2502265");
            XmlDocument wData = new XmlDocument();
            wData.Load(query);

            XmlNamespaceManager manager = new XmlNamespaceManager(wData.NameTable);
            manager.AddNamespace("yweather","http://xml.weather.yahoo.com/ns/rss/1.0");

            XmlNode channel = wData.SelectSingleNode("rss").SelectSingleNode("channel");
            XmlNodeList nodes = wData.SelectNodes("/rss/channel/item/yweather:forecast", manager);

            Temperature = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["temp"].Value;

            Condition = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["text"].Value;

            Humidity = channel.SelectSingleNode("yweather:atmosphere", manager).Attributes["humidity"].Value;

            WindSpeed = channel.SelectSingleNode("yweather:wind", manager).Attributes["speed"].Value;

            Town = channel.SelectSingleNode("yweather:location", manager).Attributes["city"].Value;

            TFCond = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", manager).Attributes["text"].Value;

            TFHigh = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", manager).Attributes["high"].Value;

            TFLow = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", manager).Attributes["low"].Value; 
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.AppendText(Temperature);
            textBox2.AppendText(Humidity);
        }

    }
}

The gui is as follows...

I need the help of kind programmers.

Answer 1

You defined Variables Temperature nad Humidity but You never assign them so they are actually just nulls. You need to use GetWeather() method. You just defined this method but never used it so Your Temperatura and Humidity variables are still nulls.

In Your EventHandler for button click You need to use GetWeather method.

private void button1_Click(object sender, EventArgs e)
    {
        GetWeather();
        textBox1.AppendText(Temperature);
        textBox2.AppendText(Humidity);
    }