Xamarin Forms Password and Confirm Password Validation

I have a Xamarin Forms application in which I have a registration form in which I need to validate Password and Confirm Password fields should be same.

Is there any way to implement this using Xamarin Behaviour?

I have already implemented Xamarin Behaviour for Required Field validation and Email Regex validation like this below-

public class RequiredValidatorBehavior : Behavior<Entry>
    {
        static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(RequiredValidatorBehavior), false);
        static readonly BindableProperty IsValidProperty = IsValidPropertyKey.BindableProperty;

        public bool IsValid
        {
            get { return (bool)base.GetValue(IsValidProperty); }
            private set { base.SetValue(IsValidPropertyKey, value); }
        }

        protected override void OnAttachedTo(Entry bindable)
        {
            bindable.Unfocused += HandleFocusChanged;
            base.OnAttachedTo(bindable);
        }
        protected override void OnDetachingFrom(Entry bindable)
        {
            bindable.Unfocused -= HandleFocusChanged;
            base.OnDetachingFrom(bindable);
        }
        void HandleFocusChanged(object sender, FocusEventArgs e)
        {
            IsValid = !string.IsNullOrEmpty (((Entry)sender).Text);
        }
    }

Implementation of Behaviour in XAML Content Page-

<Entry x:Name="password" Placeholder="New Password">
    <Entry.Behaviors>
        <local:RequiredValidatorBehavior x:Name="passwordValidator"/>   
    </Entry.Behaviors>
</Entry>

The problem is - I am new in Xamarin development and have no idea how can I get the value of both Password and Confirm Password fields in Behaviour so that I can compare them. I do not wish to compare them on click of button when the form is submitted, fields should be compared while the user is typing in the fields. Any code, help or guidance is appreciable.

https://forums.xamarin.com/discussion/34695/xaml-how-do-you-pass-a-control-view-reference-into-a-behavior

This will help you. You will use Compare Validator behavior for this as following.

<behaviors:CompareValidator x:Name="ComparePasswordsValidator" 
        CompareToEntry="{Binding Source={x:Reference PasswordEntry}}" /> 

Finally The Solution:

XAML-

<Entry x:Name="password" Placeholder="New Password" IsPassword="true">
    <Entry.Behaviors>
        <local:RequiredValidatorBehavior x:Name="passwordValidator"/>   
    </Entry.Behaviors>
</Entry>
<Entry x:Name="confirmPassword" Placeholder="Confirm Password" IsPassword="true">
    <Entry.Behaviors>
        <local:ConfirmPasswordBehavior x:Name="confirmPasswordBehavior" CompareToEntry="{Binding Source={x:Reference password}}" />
    </Entry.Behaviors>
</Entry>

BEHAVIOR-

    public class ConfirmPasswordBehavior : Behavior<Entry>
    {
        static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(ConfirmPasswordBehavior), false);
        public static readonly BindableProperty IsValidProperty = IsValidPropertyKey.BindableProperty;

        public static readonly BindableProperty CompareToEntryProperty = BindableProperty.Create("CompareToEntry", typeof(Entry), typeof(ConfirmPasswordBehavior), null);

        public Entry CompareToEntry
        {
            get { return (Entry)base.GetValue(CompareToEntryProperty); }
            set { base.SetValue(CompareToEntryProperty, value); }
        }
        public bool IsValid
        {
            get { return (bool)base.GetValue(IsValidProperty); }
            private set { base.SetValue(IsValidPropertyKey, value); }
        }
        protected override void OnAttachedTo(Entry bindable)
        {
            bindable.TextChanged += HandleTextChanged;
            base.OnAttachedTo(bindable);
        }
        protected override void OnDetachingFrom(Entry bindable)
        {
            bindable.TextChanged -= HandleTextChanged;
            base.OnDetachingFrom(bindable);
        }
        void HandleTextChanged(object sender, TextChangedEventArgs e)
        {
            var password = CompareToEntry.Text;
            var confirmPassword = e.NewTextValue;
            IsValid = password.Equals (confirmPassword);
        }
    }