Wpf Text Box , Is set to mandatory and need to change border color .

Question

Hi,
In wpf application . We a text box as mandatory and set the border color as red . We need to change the color to black when user enter values .
How to do that in xaml page .
Thank YOu

Answer 1

Hi Jeevan,
you could use a Style with a trigger for that.
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="TextBox" x:Key="TextBoxMandatoryStyle">
<Style.Triggers>
<Trigger Property="Text" Value="">
<Setter Property="BorderBrush" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBox Grid.Row="0" Style="{StaticResource TextBoxMandatoryStyle}"/>
<TextBox Grid.Row="1" Style="{StaticResource TextBoxMandatoryStyle}"/>
<TextBox Grid.Row="2" />
</Grid>
</Window>
Thomas Claudius Huber
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