Send SMS to Contact using Xamarin.Mobile in Mono for Android!

sms-contacts-xamarin.mobile-mono-for-android.cs

void button_Click(object sender, EventArgs e)
{
	//Create a new intent for choosing a contact
	var contactPickerIntent = new Intent(Intent.ActionPick,
		Android.Provider.ContactsContract.Contacts.ContentUri);
		
	//Start the contact picker expecting a result
	// with the resultCode '101'
	StartActivityForResult(contactPickerIntent, 101);
}

public override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
	//See if we are handling the contact picker request code
	//  and that the result code is ok!
	if (requestCode == 101 && resultCode == Result.Ok)
	{
		//Ensure we have data returned
		if (data == null || data.Data == null)
			return;
			
		//Xamarin.Mobile code here :)
		var addressBook = new Xamarin.Contacts.AddressBook(this);
		//Note: This is important 
		addressBook.PreferContactAggregation = true;
		
		//Load the contact via the android contact id
		// in the last segment of the Uri returned by the 
		// android contact picker
		var contact = addressBook.Load(data.Data.LastPathSegment);
		
		//Use linq to find a mobile number
		var mobile = (from p in contact.Phones where 
						p.Type == Xamarin.Contacts.PhoneType.Mobile
						select p.Number).FirstOrDefault();
						
		//See if the contact has a mobile number
		if (string.IsNullOrEmpty(mobile))
		{
			Toast.MakeText(this, "No Mobile Number for contact!", 
				ToastLength.Short).Show();
			return;
		}
	
		//Send SMS!
		var smsMgr = Android.Telephony.SmsManager.Default;
		
		smsMgr.SendTextMessage(mobile, null, "Hello World!", null, null);
	}
}

thanks , that was helpful ;)

thank you very much!!!!

The following error occurs for linq statement: Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object

it is not work sir.