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MyNewProjectName.WebAPI/Controllers/BaseApiController.cs

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+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MyNewProjectName.WebAPI.Controllers;
+
+/// <summary>
+/// Base API controller with common functionality
+/// </summary>
+[ApiController]
+[Route("api/[controller]")]
+public abstract class BaseApiController : ControllerBase
+{
+    private ISender? _mediator;
+
+    protected ISender Mediator => _mediator ??= HttpContext.RequestServices.GetRequiredService<ISender>();
+}

MyNewProjectName.WebAPI/Controllers/SamplesController.cs

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+using MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+using MyNewProjectName.Application.Features.Sample.Queries.GetSamples;
+using MyNewProjectName.Contracts.DTOs.Requests;
+using MyNewProjectName.Contracts.DTOs.Responses;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MyNewProjectName.WebAPI.Controllers;
+
+/// <summary>
+/// Sample controller to demonstrate CQRS pattern
+/// </summary>
+public class SamplesController : BaseApiController
+{
+    /// <summary>
+    /// Get all samples
+    /// </summary>
+    [HttpGet]
+    [ProducesResponseType(typeof(ApiResponse<List<SampleResponse>>), StatusCodes.Status200OK)]
+    public async Task<IActionResult> GetAll()
+    {
+        var result = await Mediator.Send(new GetSamplesQuery());
+        return Ok(ApiResponse<List<SampleDto>>.SuccessResponse(result));
+    }
+
+    /// <summary>
+    /// Create a new sample
+    /// </summary>
+    [HttpPost]
+    [ProducesResponseType(typeof(ApiResponse<Guid>), StatusCodes.Status201Created)]
+    [ProducesResponseType(typeof(ApiResponse), StatusCodes.Status400BadRequest)]
+    public async Task<IActionResult> Create([FromBody] CreateSampleRequest request)
+    {
+        var command = new CreateSampleCommand(request.Name, request.Description);
+        var id = await Mediator.Send(command);
+        return CreatedAtAction(nameof(GetAll), new { id }, ApiResponse<Guid>.SuccessResponse(id, "Sample created successfully"));
+    }
+}