Use a WebClient to call a JSON web service.

    

<UserControl x:Class='SilverlightApplication3.MainPage'
    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>

    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel x:Name="myStackPanel">
            <Button x:Name="myButton" Content="Request Content" Height="30" Width="120" Click="myButton_Click" />
        </StackPanel>
    </Grid>
</UserControl>


//File: Page.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

using System.Windows.Browser;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void RequestContent()
        {
            Uri address = new Uri("http://ws.geonames.org/findNearByWeatherJSON?lat=35.82&lng=-84.04");

            WebClient webClient = new WebClient();
            webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
            webClient.DownloadStringAsync(address);                                 
        }

        void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)                                     
        {
            HtmlWindow window = HtmlPage.Window;
            window.Alert(e.Result);                                                 
        }

        private void myButton_Click(object sender, RoutedEventArgs e)
        {
            RequestContent();
        }
    }
}

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Use a WebClient to call a JSON web service. : WebClient « Communication « Silverlight

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