Validation textbox WPF

Question

Hello... How can i add validation to a textbox that isnt bound ...

 <TextBox BorderThickness="1" Grid.Column="1" HorizontalAlignment="Stretch" Margin="3" x:Name="txtbFirstName" VerticalAlignment="Center" >
                            <TextBox.Text>
                                <Binding  >
                                    <Binding.ValidationRules>
                                        <local:validator Max="999.99" />
                                    </Binding.ValidationRules>
                                </Binding>
                            </TextBox.Text>
                        </TextBox>

doenst work

Answer 1

You may try using a ValueConverter instead, which will provide you more extensibility.

Answer 2

You could just bind the Text property to itself.

<TextBox>
    <TextBox.Text>
        <Binding  Path="Text" RelativeSource="{RelativeSource Self}">
            <Binding.ValidationRules>
                <local:Validator Max="999.99" />
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>