Code for How to Send SMS in Windows Phone 7

<!--Sample code showing usage of ApplicationBar-->
<!--<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
<shell:ApplicationBar.MenuItems>
<shell:ApplicationBarMenuItem Text="MenuItem 1"/>
<shell:ApplicationBarMenuItem Text="MenuItem 2"/>
</shell:ApplicationBar.MenuItems>
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

The Complete Code of MainPage.xaml.cs looks like this:

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 Microsoft.Phone.Controls;
using Microsoft.Phone.Tasks;
using Microsoft.Phone.Shell;

namespace Windows_SMS_Application
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();

}
SmsComposeTask objSmsComposeTask = new SmsComposeTask();
PhoneApplicationService objPhoneService = PhoneApplicationService.Current;

private void button1_Click(object sender, RoutedEventArgs e)
{
if (textBox1.Text == "" || textBox2.Text == "")
{
textBlock3.Text = "Message Sent Unsuccessful";
textBlock3.Foreground = new SolidColorBrush(Colors.Red);
}
else
{
objSmsComposeTask.To = textBox1.Text;
objSmsComposeTask.Body = textBox2.Text;
objSmsComposeTask.Show();
}

}
protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
{
objPhoneService.State["numbertext"] = textBox1.Text;
objPhoneService.State["messagetext"] = textBox2.Text;
base.OnNavigatedFrom(e);
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
object sample;
if (objPhoneService.State.TryGetValue("numbertext", out sample))
textBox1.Text = sample as string;
if (objPhoneService.State.TryGetValue("messagetext", out sample))
textBox2.Text = sample as string;
base.OnNavigatedTo(e);
}

}
}

The Output of the Application looks like this:

The Output of Sending Application looks like this:

The Output of Nothing Entered Application looks like this:

I hope this article is useful for you.