Add project files.

GreadyPoang.ViewModelLayer/GreadyPoang.ViewModelLayer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Common.Library\Common.Library.csproj" />
+    <ProjectReference Include="..\GreadyPoang.DataLayer\GreadyPoang.DataLayer.csproj" />
+    <ProjectReference Include="..\GreadyPoang.EntityLayer\GreadyPoang.EntityLayer.csproj" />
+  </ItemGroup>
+
+</Project>

GreadyPoang.ViewModelLayer/ViewModelClasses/ParticipantViewModel.cs

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+using Common.Library;
+using GreadyPoang.EntityLayer;
+using System.Collections.ObjectModel;
+
+
+namespace GreadyPoang.ViewModelLayer;
+
+public class ParticipantViewModel : ViewModelBase
+{
+    #region Constructors
+    public ParticipantViewModel() : base()
+    {
+
+    }
+
+    public ParticipantViewModel(IRepository<Participant> repo) : base()
+    {
+        Repository = repo;
+    }
+    #endregion
+
+    #region Private Variables
+    private Participant? _ParticipantObject = new();
+    private ObservableCollection<Participant> _ParticipantList = new();
+    private readonly IRepository<Participant>? Repository;
+    #endregion
+
+    #region public Properties
+
+    public Participant? ParticipantObject
+    {
+        get { return _ParticipantObject; }
+        set
+        {
+            _ParticipantObject = value;
+            RaisePropertyChanged(nameof(ParticipantObject));
+        }
+    }
+
+    public ObservableCollection<Participant> ParticipantList
+    {
+        get { return _ParticipantList; }
+        set
+        {
+            _ParticipantList = value;
+            RaisePropertyChanged(nameof(ParticipantList));
+        }
+    }
+
+    #endregion
+
+    #region Get Method
+    public ObservableCollection<Participant> Get()
+    {
+        if (Repository != null)
+        {
+            ParticipantList = new ObservableCollection<Participant>(Repository.Get());
+        }
+
+        return new();
+    }
+
+    #endregion
+
+    #region Get(id) Method
+    public Participant? Get(int id)
+    {
+        try
+        {
+            ParticipantObject = Repository.Get(id);
+        }
+        catch (Exception ex)
+        {
+            System.Diagnostics.Debug.WriteLine($"Error in Get method: {ex.Message}");
+        }
+
+        return ParticipantObject;
+    }
+    public virtual bool Save()
+    {
+        if (Repository == null || ParticipantObject == null)
+        {
+            return false;
+        }
+        var tmp = Repository.Save(ParticipantObject);
+        if (tmp)
+        {
+            ParticipantObject = new Participant();
+            this.Get();
+        }
+        return tmp;
+    }
+    #endregion
+}