diff --git a/dotnet/AipsCore/AipsCore.csproj b/dotnet/AipsCore/AipsCore.csproj
index 0124700..d062ba1 100644
--- a/dotnet/AipsCore/AipsCore.csproj
+++ b/dotnet/AipsCore/AipsCore.csproj
@@ -17,6 +17,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <Folder Include="Domain\Models\WhiteboardMembership\Validation\" />
       <Folder Include="Infrastructure\Persistence\Db\Migrations\" />
     </ItemGroup>
 
diff --git a/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommand.cs b/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommand.cs
new file mode 100644
index 0000000..00b0665
--- /dev/null
+++ b/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommand.cs
@@ -0,0 +1,13 @@
+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+namespace AipsCore.Application.Models.WhiteboardMembership.Command.CreateWhiteboardMembership;
+
+public record CreateWhiteboardMembershipCommand(
+    string WhiteboardId, 
+    string UserId,
+    bool IsBanned,
+    bool EditingEnabled,
+    bool CanJoin,
+    DateTime LastInteractedAt)
+    : ICommand<WhiteboardMembershipId>;
\ No newline at end of file
diff --git a/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommandHandler.cs b/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommandHandler.cs
new file mode 100644
index 0000000..127419f
--- /dev/null
+++ b/dotnet/AipsCore/Application/Models/WhiteboardMembership/Command/CreateWhiteboardMembership/CreateWhiteboardMembershipCommandHandler.cs
@@ -0,0 +1,34 @@
+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Abstract;
+using AipsCore.Domain.Models.WhiteboardMembership.External;
+using AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+namespace AipsCore.Application.Models.WhiteboardMembership.Command.CreateWhiteboardMembership;
+
+public class CreateWhiteboardMembershipCommandHandler : ICommandHandler<CreateWhiteboardMembershipCommand, WhiteboardMembershipId>
+{
+    private readonly IWhiteboardMembershipRepository _whiteboardMembershipRepository;
+    private readonly IUnitOfWork _unitOfWork;
+    
+    public CreateWhiteboardMembershipCommandHandler(IWhiteboardMembershipRepository whiteboardMembershipRepository, IUnitOfWork unitOfWork)
+    {
+        _whiteboardMembershipRepository = whiteboardMembershipRepository;
+        _unitOfWork = unitOfWork;
+    }
+    
+    public async Task<WhiteboardMembershipId> Handle(CreateWhiteboardMembershipCommand command, CancellationToken cancellationToken = default)
+    {
+        var whiteboardMembership = Domain.Models.WhiteboardMembership.WhiteboardMembership.Create(
+            command.WhiteboardId, 
+            command.UserId, 
+            command.IsBanned, 
+            command.EditingEnabled, 
+            command.CanJoin, 
+            command.LastInteractedAt);
+
+        await _whiteboardMembershipRepository.Save(whiteboardMembership, cancellationToken);
+        await _unitOfWork.SaveChangesAsync(cancellationToken);
+        
+        return whiteboardMembership.Id;
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInFutureRule.cs b/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInFutureRule.cs
new file mode 100644
index 0000000..cf48254
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInFutureRule.cs
@@ -0,0 +1,22 @@
+using AipsCore.Domain.Abstract.Rule;
+
+namespace AipsCore.Domain.Common.Validation.Rules;
+
+public class DateInFutureRule : AbstractRule
+{
+    private readonly DateTime _date;
+    private readonly DateTime _now;
+    
+    public DateInFutureRule(DateTime date) 
+    {
+        _date = date;
+        _now = DateTime.Now;
+    }
+    
+    protected override string ErrorCode => "date_in_future";
+    protected override string ErrorMessage => "Date must be in the future";
+    public override bool Validate()
+    {
+        return _date > _now;
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInPastRule.cs b/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInPastRule.cs
new file mode 100644
index 0000000..2120aa6
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Common/Validation/Rules/DateInPastRule.cs
@@ -0,0 +1,22 @@
+using AipsCore.Domain.Abstract.Rule;
+
+namespace AipsCore.Domain.Common.Validation.Rules;
+
+public class DateInPastRule : AbstractRule
+{
+    private readonly DateTime _date;
+    private readonly DateTime _now;
+
+    public DateInPastRule(DateTime date) 
+    {
+        _date = date;
+        _now = DateTime.Now;
+    }
+    
+    protected override string ErrorCode => "date_in_past";
+    protected override string ErrorMessage => "Date must be in the past";
+    public override bool Validate()
+    {
+        return _date < _now;
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/External/IWhiteboardMembershipRepository.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/External/IWhiteboardMembershipRepository.cs
new file mode 100644
index 0000000..2d70762
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/External/IWhiteboardMembershipRepository.cs
@@ -0,0 +1,9 @@
+using AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.External;
+
+public interface IWhiteboardMembershipRepository
+{
+    Task<WhiteboardMembership?> Get(WhiteboardMembershipId whiteboardMembershipId, CancellationToken cancellationToken = default);
+    Task Save(WhiteboardMembership whiteboardMembership, CancellationToken cancellationToken = default);
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipCanJoin.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipCanJoin.cs
new file mode 100644
index 0000000..48591ad
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipCanJoin.cs
@@ -0,0 +1,20 @@
+using AipsCore.Domain.Abstract.Rule;
+using AipsCore.Domain.Abstract.ValueObject;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+public record WhiteboardMembershipCanJoin : AbstractValueObject
+{
+    public bool CanJoinValue { get; init; }
+
+    public WhiteboardMembershipCanJoin(bool CanJoinValue)
+    {
+        this.CanJoinValue = CanJoinValue;
+        Validate();
+    }
+    
+    protected override ICollection<IRule> GetValidationRules()
+    {
+        return [];
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipEditingEnabled.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipEditingEnabled.cs
new file mode 100644
index 0000000..da674c1
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipEditingEnabled.cs
@@ -0,0 +1,20 @@
+using AipsCore.Domain.Abstract.Rule;
+using AipsCore.Domain.Abstract.ValueObject;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+public record WhiteboardMembershipEditingEnabled : AbstractValueObject
+{
+    public bool EditingEnabledValue { get; init; }
+
+    public WhiteboardMembershipEditingEnabled(bool EditingEnabledValue)
+    {
+        this.EditingEnabledValue = EditingEnabledValue;
+        Validate();
+    }
+    
+    protected override ICollection<IRule> GetValidationRules()
+    {
+        return [];
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipId.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipId.cs
new file mode 100644
index 0000000..4f786e0
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipId.cs
@@ -0,0 +1,8 @@
+using AipsCore.Domain.Common.ValueObjects;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+public record WhiteboardMembershipId(string IdValue) : DomainId(IdValue)
+{
+    public static WhiteboardMembershipId Any() => new(Guid.NewGuid().ToString());
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipIsBanned.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipIsBanned.cs
new file mode 100644
index 0000000..363e9ab
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipIsBanned.cs
@@ -0,0 +1,20 @@
+using AipsCore.Domain.Abstract.Rule;
+using AipsCore.Domain.Abstract.ValueObject;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+public record WhiteboardMembershipIsBanned : AbstractValueObject
+{
+    public bool IsBannedValue { get; init; }
+
+    public WhiteboardMembershipIsBanned(bool IsBannedValue)
+    {
+        this.IsBannedValue = IsBannedValue;
+        Validate();
+    }
+    
+    protected override ICollection<IRule> GetValidationRules()
+    {
+        return [];
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipLastInteractedAt.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipLastInteractedAt.cs
new file mode 100644
index 0000000..b9b8952
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/ValueObjects/WhiteboardMembershipLastInteractedAt.cs
@@ -0,0 +1,23 @@
+using AipsCore.Domain.Abstract.Rule;
+using AipsCore.Domain.Abstract.ValueObject;
+using AipsCore.Domain.Common.Validation.Rules;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+public record WhiteboardMembershipLastInteractedAt : AbstractValueObject
+{
+    public DateTime LastInteractedAtValue { get; init; }
+
+    public WhiteboardMembershipLastInteractedAt(DateTime LastInteractedAtValue)
+    {
+        this.LastInteractedAtValue = LastInteractedAtValue;
+        Validate();
+    }
+    
+    protected override ICollection<IRule> GetValidationRules()
+    {
+        return [
+            new DateInPastRule(LastInteractedAtValue)
+        ];
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Models/WhiteboardMembership/WhiteboardMembership.cs b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/WhiteboardMembership.cs
new file mode 100644
index 0000000..6cd006f
--- /dev/null
+++ b/dotnet/AipsCore/Domain/Models/WhiteboardMembership/WhiteboardMembership.cs
@@ -0,0 +1,105 @@
+using AipsCore.Domain.Models.User.ValueObjects;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+using AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+
+namespace AipsCore.Domain.Models.WhiteboardMembership;
+
+public class WhiteboardMembership
+{
+    public WhiteboardMembershipId Id { get; private set; }
+    public WhiteboardId WhiteboardId { get; private set; }
+    public UserId UserId { get; private set; }
+    public WhiteboardMembershipIsBanned IsBanned { get; private set; }
+    public WhiteboardMembershipEditingEnabled EditingEnabled { get; private set; }
+    public WhiteboardMembershipCanJoin CanJoin { get; private set; }
+    public WhiteboardMembershipLastInteractedAt LastInteractedAt { get; private set; }
+
+    public WhiteboardMembership(
+        WhiteboardMembershipId id,
+        Whiteboard.Whiteboard owner, 
+        User.User user,
+        WhiteboardMembershipIsBanned isBanned,
+        WhiteboardMembershipEditingEnabled editingEnabled,
+        WhiteboardMembershipCanJoin canJoin,
+        WhiteboardMembershipLastInteractedAt lastInteractedAt)
+    {
+        Id = id;
+        WhiteboardId = owner.Id;
+        UserId = user.Id;
+        IsBanned = isBanned;
+        EditingEnabled = editingEnabled;
+        CanJoin = canJoin;
+        LastInteractedAt = lastInteractedAt;
+    }
+    
+    public WhiteboardMembership(
+        WhiteboardMembershipId id,
+        WhiteboardId ownerId, 
+        UserId userId,
+        WhiteboardMembershipIsBanned isBanned,
+        WhiteboardMembershipEditingEnabled editingEnabled,
+        WhiteboardMembershipCanJoin canJoin,
+        WhiteboardMembershipLastInteractedAt lastInteractedAt)
+    {
+        Id = id;
+        WhiteboardId = ownerId;
+        UserId = userId;
+        IsBanned = isBanned;
+        EditingEnabled = editingEnabled;
+        CanJoin = canJoin;
+        LastInteractedAt = lastInteractedAt;
+    }
+    
+    public static WhiteboardMembership Create(
+        string id, 
+        string ownerId,
+        string userId,
+        bool isBanned,
+        bool editingEnabled,
+        bool canJoin,
+        DateTime lastInteractedAt)
+    {
+        var whiteboardMembershipId = new WhiteboardMembershipId(id);
+        var whiteboardId = new WhiteboardId(ownerId);
+        var userIdVo = new UserId(userId);
+        var isBannedVo = new WhiteboardMembershipIsBanned(isBanned);
+        var editingEnabledVo = new WhiteboardMembershipEditingEnabled(editingEnabled);
+        var canJoinVo = new WhiteboardMembershipCanJoin(canJoin);
+        var lastInteractedAtVo = new WhiteboardMembershipLastInteractedAt(lastInteractedAt);
+        
+        return new WhiteboardMembership(
+            whiteboardMembershipId, 
+            whiteboardId, 
+            userIdVo, 
+            isBannedVo, 
+            editingEnabledVo, 
+            canJoinVo, 
+            lastInteractedAtVo);
+    }
+    
+    public static WhiteboardMembership Create(
+        string ownerId,
+        string userId,
+        bool isBanned,
+        bool editingEnabled,
+        bool canJoin,
+        DateTime lastInteractedAt)
+    {
+        var whiteboardMembershipId = WhiteboardMembershipId.Any();
+        var whiteboardId = new WhiteboardId(ownerId);
+        var userIdVo = new UserId(userId);
+        var isBannedVo = new WhiteboardMembershipIsBanned(isBanned);
+        var editingEnabledVo = new WhiteboardMembershipEditingEnabled(editingEnabled);
+        var canJoinVo = new WhiteboardMembershipCanJoin(canJoin);
+        var lastInteractedAtVo = new WhiteboardMembershipLastInteractedAt(lastInteractedAt);
+        
+        return new WhiteboardMembership(
+            whiteboardMembershipId, 
+            whiteboardId, 
+            userIdVo, 
+            isBannedVo, 
+            editingEnabledVo, 
+            canJoinVo, 
+            lastInteractedAtVo);
+    }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Infrastructure/DI/PersistenceRegistrationExtensions.cs b/dotnet/AipsCore/Infrastructure/DI/PersistenceRegistrationExtensions.cs
index 80c2909..182f7e7 100644
--- a/dotnet/AipsCore/Infrastructure/DI/PersistenceRegistrationExtensions.cs
+++ b/dotnet/AipsCore/Infrastructure/DI/PersistenceRegistrationExtensions.cs
@@ -1,6 +1,7 @@
 using AipsCore.Domain.Abstract;
 using AipsCore.Domain.Models.User.External;
 using AipsCore.Domain.Models.Whiteboard.External;
+using AipsCore.Domain.Models.WhiteboardMembership.External;
 using AipsCore.Infrastructure.DI.Configuration;
 using AipsCore.Infrastructure.Persistence.Db;
 using AipsCore.Infrastructure.Persistence.User;
@@ -26,6 +27,7 @@ public static class PersistenceRegistrationExtensions
         services.AddTransient<IUnitOfWork, EfUnitOfWork>();
         services.AddTransient<IUserRepository, UserRepository>();
         services.AddTransient<IWhiteboardRepository, WhiteboardRepository>();
+        services.AddTransient<IWhiteboardMembershipRepository, IWhiteboardMembershipRepository>();
         
         return services;
     }
diff --git a/dotnet/AipsCore/Infrastructure/Persistence/Db/AipsDbContext.cs b/dotnet/AipsCore/Infrastructure/Persistence/Db/AipsDbContext.cs
index 8623f8e..cbe5e5d 100644
--- a/dotnet/AipsCore/Infrastructure/Persistence/Db/AipsDbContext.cs
+++ b/dotnet/AipsCore/Infrastructure/Persistence/Db/AipsDbContext.cs
@@ -7,6 +7,7 @@ public class AipsDbContext : DbContext
     public DbSet<User.User> Users { get; set; }
     public DbSet<Whiteboard.Whiteboard> Whiteboards { get; set; }
     public DbSet<Shape.Shape> Shapes { get; set; }
+    public DbSet<WhiteboardMembership.WhiteboardMembership> WhiteboardMemberships { get; set; }
 
     public AipsDbContext(DbContextOptions<AipsDbContext> options)
         : base(options)
diff --git a/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembership.cs b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembership.cs
new file mode 100644
index 0000000..c2cd8d8
--- /dev/null
+++ b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembership.cs
@@ -0,0 +1,25 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace AipsCore.Infrastructure.Persistence.WhiteboardMembership;
+
+public class WhiteboardMembership 
+{
+    [Key]
+    public Guid Id { get; set; }
+    
+    public Guid WhiteboardId { get; set; }
+
+    public Whiteboard.Whiteboard? Whiteboard { get; set; } = null!;
+    
+    public Guid UserId { get; set; }
+
+    public User.User? User { get; set; } = null!;
+    
+    public bool IsBanned { get; set; }
+    
+    public bool EditingEnabled { get; set; }
+    
+    public bool CanJoin { get; set; }
+    
+    public DateTime LastInteractedAt { get; set; }
+}
\ No newline at end of file
diff --git a/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs
new file mode 100644
index 0000000..1913283
--- /dev/null
+++ b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs
@@ -0,0 +1,63 @@
+using AipsCore.Domain.Models.WhiteboardMembership.External;
+using AipsCore.Domain.Models.WhiteboardMembership.ValueObjects;
+using AipsCore.Infrastructure.Persistence.Db;
+
+namespace AipsCore.Infrastructure.Persistence.WhiteboardMembership;
+
+public class WhiteboardMembershipRepository : IWhiteboardMembershipRepository
+{
+    private readonly AipsDbContext _context;
+    
+    public WhiteboardMembershipRepository(AipsDbContext context)
+    {
+        _context = context;
+    }
+    
+    public async Task<Domain.Models.WhiteboardMembership.WhiteboardMembership?> Get(WhiteboardMembershipId whiteboardMembershipId, CancellationToken cancellationToken = default)
+    {
+        var whiteboardMembershipEntity = await _context.WhiteboardMemberships.FindAsync(new Guid(whiteboardMembershipId.IdValue));
+        
+        if (whiteboardMembershipEntity is null) return null;
+
+        return Domain.Models.WhiteboardMembership.WhiteboardMembership.Create(
+            whiteboardMembershipEntity.Id.ToString(),
+            whiteboardMembershipEntity.WhiteboardId.ToString(),
+            whiteboardMembershipEntity.UserId.ToString(),
+            whiteboardMembershipEntity.IsBanned,
+            whiteboardMembershipEntity.EditingEnabled,
+            whiteboardMembershipEntity.CanJoin,
+            whiteboardMembershipEntity.LastInteractedAt);
+    }
+
+    public async Task Save(Domain.Models.WhiteboardMembership.WhiteboardMembership whiteboardMembership, CancellationToken cancellationToken = default)
+    {
+        var whiteboardMembershipEntity = await _context.WhiteboardMemberships.FindAsync(new Guid(whiteboardMembership.Id.IdValue));
+        
+        if (whiteboardMembershipEntity is not null)
+        {
+            whiteboardMembershipEntity.IsBanned = whiteboardMembership.IsBanned.IsBannedValue;
+            whiteboardMembershipEntity.EditingEnabled = whiteboardMembership.EditingEnabled.EditingEnabledValue;
+            whiteboardMembershipEntity.CanJoin = whiteboardMembership.CanJoin.CanJoinValue;
+            whiteboardMembershipEntity.LastInteractedAt = whiteboardMembership.LastInteractedAt.LastInteractedAtValue;
+            
+            _context.Update(whiteboardMembershipEntity);
+        }
+        else
+        {
+            whiteboardMembershipEntity = new WhiteboardMembership()
+            {
+                Id = new Guid(whiteboardMembership.Id.IdValue),
+                WhiteboardId = new Guid(whiteboardMembership.WhiteboardId.IdValue),
+                Whiteboard = null,
+                UserId = new Guid(whiteboardMembership.UserId.IdValue),
+                User = null,
+                IsBanned = whiteboardMembership.IsBanned.IsBannedValue,
+                EditingEnabled = whiteboardMembership.EditingEnabled.EditingEnabledValue,
+                CanJoin = whiteboardMembership.CanJoin.CanJoinValue,
+                LastInteractedAt = whiteboardMembership.LastInteractedAt.LastInteractedAtValue
+            };
+            
+            _context.Add(whiteboardMembershipEntity);
+        }
+    }
+}
\ No newline at end of file