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MyNewProjectName.Application/Features/Sample/Commands/CreateSample/CreateSampleCommand.cs

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+using MediatR;
+
+namespace MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+
+/// <summary>
+/// Command to create a new sample
+/// </summary>
+public record CreateSampleCommand(string Name, string? Description) : IRequest<Guid>;

MyNewProjectName.Application/Features/Sample/Commands/CreateSample/CreateSampleCommandHandler.cs

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+using MyNewProjectName.Domain.Entities;
+using MyNewProjectName.Domain.Interfaces;
+using MediatR;
+
+namespace MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+
+/// <summary>
+/// Handler for CreateSampleCommand
+/// </summary>
+public class CreateSampleCommandHandler : IRequestHandler<CreateSampleCommand, Guid>
+{
+    private readonly IRepository<SampleEntity> _repository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public CreateSampleCommandHandler(IRepository<SampleEntity> repository, IUnitOfWork unitOfWork)
+    {
+        _repository = repository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<Guid> Handle(CreateSampleCommand request, CancellationToken cancellationToken)
+    {
+        var entity = new SampleEntity
+        {
+            Id = Guid.NewGuid(),
+            Name = request.Name,
+            Description = request.Description,
+            IsActive = true,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        await _repository.AddAsync(entity, cancellationToken);
+        await _unitOfWork.SaveChangesAsync(cancellationToken);
+
+        return entity.Id;
+    }
+}

MyNewProjectName.Application/Features/Sample/Commands/CreateSample/CreateSampleCommandValidator.cs

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+using FluentValidation;
+
+namespace MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+
+/// <summary>
+/// Validator for CreateSampleCommand
+/// </summary>
+public class CreateSampleCommandValidator : AbstractValidator<CreateSampleCommand>
+{
+    public CreateSampleCommandValidator()
+    {
+        RuleFor(x => x.Name)
+            .NotEmpty().WithMessage("Name is required.")
+            .MaximumLength(200).WithMessage("Name must not exceed 200 characters.");
+
+        RuleFor(x => x.Description)
+            .MaximumLength(1000).WithMessage("Description must not exceed 1000 characters.");
+    }
+}