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Editorial Team
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Asked: 2026-05-24T21:47:13+00:00

I have a TextBox bound to some property. I have implemented IDataErrorInfo for performing

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I have a TextBox bound to some property. I have implemented IDataErrorInfo for performing validation. Recently I was seeing some control in web which shows an error like a red triangle.
I have attached the sample below:

enter image description here

I know I have to write error template to display this whenever an error occurs. When the user hovers the red triangle, it will display the error message in ToolTip. How do I display an error textBox like the one I have uploaded. How to get the red triangle in error template?

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1 Answer

  1. Editorial Team

    Here is an example that looks like this

    enter image description here

    Use it like

    <TextBox Validation.ErrorTemplate="{StaticResource topRightCornerErrorTemplate}"
         .../>

    ErrorTemplate

    <ControlTemplate x:Key="topRightCornerErrorTemplate">
    <Grid>
        <Polygon Points="40,20 40,0 0,0"
                 Stroke="Black"
                 StrokeThickness="1"
                 Fill="Red"
                 HorizontalAlignment="Right"
                 VerticalAlignment="Top"
                 ToolTip="{Binding ElementName=adorner, 
                                   Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"/>
        <AdornedElementPlaceholder x:Name="adorner"/>
    </Grid>
</ControlTemplate>
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