DataTrigger In Wpf:-

While binding we can change the properties of a control based  on the binding property value.

->Create a user class with properties UserName,Address and Role.

public class User

    {

        public string UserName { get; set; }

        public string Address { get; set; }

        public string Role { get; set; }

    }

->Add the DataTrigger.

<Window x:Class="WpfDataTriggers.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" Loaded="Window_Loaded">

    <Grid>

        <Grid.Resources>

            <!--Add the style for label-->

            <Style TargetType="{x:Type Label}" x:Key="lbStyle">

                <Style.Triggers>

                    <!--Check the user  rights-->

                    <!--If the user is admin-->

                    <DataTrigger Binding="{Binding Role}" Value="Admin">

                        <Setter Property="Content" Value="You have administration rights."></Setter>

                        <Setter Property="Background" Value="Green"></Setter>

                    </DataTrigger>

                    <!--If the user is guest-->

                    <DataTrigger Binding="{Binding Role}" Value="Guest">

                        <Setter Property="Content" Value="You dont' have administration rights."></Setter>

                        <Setter Property="Background" Value="Red"></Setter>

                    </DataTrigger>

                </Style.Triggers>

            </Style>

        </Grid.Resources>

        <ListBox Name="lstUsers">

            <ListBox.ItemTemplate>

                <DataTemplate>

                    <Grid >

                        <Grid.ColumnDefinitions>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="200"></ColumnDefinition>

                        </Grid.ColumnDefinitions>

                        <!--Bind the user name-->

                        <Label Grid.Column="0" Content="{Binding UserName}"></Label>

                        <!--Bind the address-->

                        <Label Grid.Column="1" Content="{Binding Address}"></Label>

                        <!--Apply the style resource for label-->

                        <Label Grid.Column="2" Style="{StaticResource lbStyle}"></Label>

                    </Grid>

                </DataTemplate>

            </ListBox.ItemTemplate>

        </ListBox>

    </Grid>

</Window>

->Bind the listbox in the window load event.

private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            //User list

            List<User> lstUser = new List<User>();

            //Adding users.

            lstUser.Add(new User() { UserName = "David", Address = "Mumbai", Role = "Admin" });

            lstUser.Add(new User() { UserName = "Anderson", Address = "Pune", Role = "Guest" });

            lstUser.Add(new User() { UserName = "Andri", Address = "Mumbai", Role = "Admin" });

            //Set the item source here.

            lstUsers.ItemsSource = lstUser;

        }

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