Added new kb article cancel-checkbox-change-net-maui

Author: KB Bot

knowledge-base/cancel-checkbox-change-net-maui.md

@@ -0,0 +1,96 @@
+---
+title: Cancel Checkbox Change in .NET MAUI
+description: Learn how to cancel a Checkbox change in .NET MAUI using the IsCheckedChanged event.
+type: how-to
+page_title: Prevent Checkbox State Change in .NET MAUI
+meta_title: Prevent Checkbox State Change in .NET MAUI
+slug: cancel-checkbox-change-net-maui
+tags: checkbox, .net maui, ischeckedchanged, ischecked, binding
+res_type: kb
+---
+
+## Environment
+
+| Version | Product | Author | 
+| --- | --- | ---- | 
+| 12.0.0 | Telerik UI for .NET MAUI CheckBox | [Dobrinka Yordanova](https://www.telerik.com/blogs/author/dobrinka-yordanova) | 
+
+## Description
+
+I want to cancel a state change in a Checkbox control in .NET MAUI based on a specific condition. This allows me to maintain control over the Checkbox's state and update it dynamically.
+
+This knowledge base article also answers the following questions:
+- How to prevent Checkbox state change in .NET MAUI?
+- How to handle the `IsCheckedChanged` event to cancel state change?
+- How to implement conditional logic for Checkbox state in .NET MAUI?
+
+## Solution
+
+To achieve this behavior, use the `IsCheckedChanged` event and set the `IsChecked` property conditionally.
+
+**1.** Create a `ViewModel` class to store and bind the Checkbox state.
+
+```csharp
+public class ViewModel : NotifyPropertyChangedBase
+{
+    private bool myproperty = false;
+    public bool MyProperty
+    {
+        get => this.myproperty;
+        set
+        {
+            if (this.myproperty != value)
+            {
+                this.myproperty = value;
+                OnPropertyChanged();
+            }
+        }
+    }
+}
+```
+
+**2.** Use the `IsCheckedChanged` event to monitor state changes.
+
+**3.** Implement conditional logic to revert the state if a condition is not met.
+
+```csharp
+public partial class MainPage : ContentPage
+{
+    ViewModel vm;
+    public bool OperationPassed = true;
+
+    public MainPage()
+    {
+        InitializeComponent();
+        this.vm = new ViewModel();
+        this.BindingContext = this.vm;
+    }
+
+    private void RadCheckBox_IsCheckedChanged(object sender, IsCheckedChangedEventArgs e)
+    {
+        // Check condition and revert state
+        if (this.OperationPassed is false)
+        {
+            this.vm.MyProperty = false;
+        }
+        else
+        {
+            this.vm.MyProperty = true;
+        }
+    }
+}
+```
+
+**4.** The Checkbox definition in XAML:
+
+```xml
+<HorizontalStackLayout Spacing="5" VerticalOptions="Start">
+    <telerik:RadCheckBox IsChecked="{Binding MyProperty, Mode=TwoWay}" 
+                         IsCheckedChanged="RadCheckBox_IsCheckedChanged" 
+                         IsThreeState="False"/>
+</HorizontalStackLayout>
+```
+
+## See Also
+
+- [CheckBox Overview](https://www.telerik.com/maui-ui/documentation/controls/checkbox/overview)