<DataGrid>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Style.Triggers>
<DataTrigger Binding="{Binding IsError, Mode=OneWay}" Value="True">
<Setter Property="Foreground" Value="IndianRed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
</DataGrid>