UserControl1.xaml:


       <UserControl.DataContext >
                <local:ViewModel/>
            </UserControl.DataContext>
            <UserControl.Resources>
                <Style TargetType="ListViewItem">
                    <Setter Property="Background" Value="Green"/>
                    <Setter  Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="ListViewItem" >
                                <Border x:Name="border" Height="200" Width="200"  BorderBrush="Orange" BorderThickness="1"
                                 CornerRadius="10" Padding="5">
                                  
                                    <Grid>
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="5*"/>
                                            <RowDefinition/>
                                        </Grid.RowDefinitions>
                                        <TextBlock Text="{Binding FirstName}"/>
                                        <TextBlock Grid.Row="1" Text="{Binding LastName}"/>
        
                                    </Grid>
                                    </Border>
                                <ControlTemplate.Triggers >
                                    <Trigger Property="IsSelected" Value="True" >
                                        <Setter Property="Background" Value="Red" TargetName="border"/>
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                        <Trigger Property="IsSelected" Value="False">
                            <Setter Property="Background" Value="Red"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </UserControl.Resources>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <WrapPanel Grid.Row="0" HorizontalAlignment="Center">
                  ...
                   
                </WrapPanel>
                <ListView ItemsSource="{Binding AllAthletesItemViewModels}"
                       SelectedItem="{Binding SelectedAllAthletesItemViewModel}"
                       ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                       Grid.Row="1">
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <WrapPanel />
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                </ListView>
            </Grid>


UserControl1.xaml.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Collections.ObjectModel;
using System.ComponentModel;

using System.Runtime.CompilerServices;

namespace ChangeColorinDataTemplate
{
    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }
    }
    public class ViewModel : INotifyPropertyChanged
    {
        private string headLastName ="hello";
        public string HeadLastName
        {
            get { return headLastName; }
            set
            {
                if (headLastName != value)
                {
                    headLastName = value;
                    OnPropertyChanged("HeadLastName");
                }
            }
        }
        private User selecedItme;
        public User SelectedAllAthletesItemViewModel
        {
            get { return selecedItme; }
            set
            {
                if (selecedItme != value)
                {
                    selecedItme = value;
                    OnPropertyChanged("SelecedItme");
                }
            }
        }
        private ObservableCollection<User> users = new ObservableCollection<User>();
        public ObservableCollection<User> AllAthletesItemViewModels
        {
            get { return users; }
            set
            {
                if (users != value)
                {
                    users = value;
                    OnPropertyChanged("Users");
                }
            }
        }
        public ViewModel()
        {
            AllAthletesItemViewModels.Add(new User() { Id = 1, LastName = "Last1",FirstName ="firstname1" });
            AllAthletesItemViewModels.Add(new User() { Id = 2, LastName = "Last2", FirstName = "firstname2" });
            AllAthletesItemViewModels.Add(new User() { Id = 3, LastName = "Last3", FirstName = "firstname3" });
            AllAthletesItemViewModels.Add(new User() { Id = 5, LastName = "Last4", FirstName = "firstname4" });
            AllAthletesItemViewModels.Add(new User() { Id = 6, LastName = "Last5", FirstName = "firstname5" });
        }
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string name = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }
    }
    public class User
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}