CheckBox Widget in Xamarin

In this Article, We will see How to use CheckBox widget control and CheckBox's CheckedChange Event in Xamarin.For Demonstration, I am going to create a Simple application in which if user accept the terms and condition(using CheckBox) then Submit button become enabled. Before starting, I suggest you read my previous articles of this series.

• Hello World Application in Xamarin
• Creating Splash Screen for Android App in Xamarin. 
• Auto Complete Text View in Xamarin

Let's Begin:
1) Create a New Android Application.

2) Drop a CheckBox (with id="@+id/checkBox1") and Button (with id="@+id/btn_Submit") control onto the Layout, Main.axml.

Set the Text of CheckBox as Accept Terms and Condition and Button's Text as Submit.

Main.axml Code:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent">     <CheckBox         android:text="Accept Terms and Conditions"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:id="@+id/checkBox1" />     <Button         android:text="Submit"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:id="@+id/btn_Submit"         android:enabled="false" /> </LinearLayout>

In Activity1.cs, We have created CheckBox CheckedChange Event. The following is Activity1.cs Code:

using System; using Android.App; using Android.Content; using Android.Runtime; using Android.Views; using Android.Widget; using Android.OS; namespace CheckBoxDemo {     [Activity(Label = "CheckBoxDemo", MainLauncher = true, Icon = "@drawable/icon")]     public class Activity1 : Activity     {         //Create instance of Button         Button btn_Submit;         protected override void OnCreate(Bundle bundle)         {             base.OnCreate(bundle);             //setting the view for the Activity              SetContentView(Resource.Layout.Main);             //Get btn_Submit Button and checkBox1 CheckBox control from the Main.xaml Layout.             btn_Submit = FindViewById<Button>(Resource.Id.btn_Submit);             CheckBox checkBox1 = FindViewById<CheckBox>(Resource.Id.checkBox1);             //CheckBox CheckedChange Event             checkBox1.CheckedChange += checkBox1_CheckedChange;             //btn_Submit Click Event             btn_Submit.Click += btn_Submit_Click;         }         void checkBox1_CheckedChange(object sender, CompoundButton.CheckedChangeEventArgs e)         {             //If CheckBox is Checked             if(e.IsChecked==true)             {                 btn_Submit.Enabled = true;             }             else             {                 btn_Submit.Enabled = false;             }         }         void btn_Submit_Click(object sender, EventArgs e)         {             Toast.MakeText(this,"Thanks for accepting Terms and Condition",ToastLength.Short).Show();         }     } }

Final Preview:

Hope you like it. Thanks.

[Download Source Code via Google Drive]