Trying to bind RadioButtonGroup.SelectedValue to a vaiable....

Hi CarloGoretti-1185,

Welcome to our Microsoft Q&A platform!

The SelectedValue property is updated to the Value property of the checked RadioButton.

Here is a demo you can refer to.

XAML:

<StackLayout RadioButtonGroup.GroupName="TrainingStyleRB"   
                 RadioButtonGroup.SelectedValue="{Binding Color}">  
    <Label Text="{Binding Color, StringFormat='The Selection is {0}'}"/>  
  
    <RadioButton Content="Red"  
                     Value="Red"/>  
    <RadioButton Content="Green"  
                     Value="Green"/>  
    <RadioButton Content="Blue"  
                     Value="Blue"/>  
    <RadioButton Content="Other"  
                     Value="Other"/>  
</StackLayout>  

ViewModel:

class MainPageViewModel : INotifyPropertyChanged  
{  
    string color;  
    public string Color  
    {  
        get => color;  
        set  
        {  
            color = value;  
            OnPropertyChanged("Color");  
        }  
    }  
  
    public event PropertyChangedEventHandler PropertyChanged;  
    protected void OnPropertyChanged(string propertyName)  
    {  
        var handler = PropertyChanged;  
        if (handler != null)  
            handler(this, new PropertyChangedEventArgs(propertyName));  
    }  
  
    public MainPageViewModel()  
    {  
        Color = "Red";  
    }  
}  

Regards,
Kyle

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