first time include all file

CarParkValidationAPI/Helpers/ErrorHandlerMiddleware.cs

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+using CarParkValidationAPI.Entities;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace CarParkValidationAPI.Helpers
+{
+    public class ErrorHandlerMiddleware
+    {
+        private readonly RequestDelegate _next;
+        private readonly ILogger<ErrorHandlerMiddleware> _logger;
+        private readonly IHostEnvironment _env;
+
+        public ErrorHandlerMiddleware(RequestDelegate next, 
+            ILogger<ErrorHandlerMiddleware> logger, IHostEnvironment env)
+        {
+            _next = next;
+            _logger = logger;
+            _env = env;
+        }
+        public async Task Invoke(HttpContext context)
+        {
+            try
+            {
+                await _next(context);
+            }
+            catch (Exception ex)
+            {
+                var response = context.Response;
+                response.ContentType = "application/json";
+                _logger.LogError(ex, ex.Message);
+                /*
+                switch (ex)
+                {
+                    //  case Exception e:
+                    //    // custom application error
+                    //    response.StatusCode = (int)HttpStatusCode.BadRequest;
+                    //    break;
+                    case KeyNotFoundException:
+                        // not found error
+                        response.StatusCode = (int)HttpStatusCode.NotFound;
+                        break;
+                    default:
+                        // unhandled error
+                        response.StatusCode = (int)HttpStatusCode.InternalServerError;
+                        break;
+                } */
+                response.StatusCode = ex switch
+                {
+                    //  case Exception e:
+                    //    // custom application error
+                    //    response.StatusCode = (int)HttpStatusCode.BadRequest;
+                    //    break;
+                    KeyNotFoundException => (int)HttpStatusCode.NotFound,// not found error
+                    _ => (int)HttpStatusCode.InternalServerError,// unhandled error
+                };
+                //response.StatusCode = (int)HttpStatusCode.InternalServerError;
+                var res = _env.IsDevelopment() ?
+                    new ApiException(response.StatusCode, ex.Message, ex.StackTrace?.ToString())
+                    : new ApiException(response.StatusCode, "Internal Server Error");
+
+                var options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase };
+                var json = JsonSerializer.Serialize(res, options);
+                await response.WriteAsync(json);
+            }
+        }
+    }
+}

CarParkValidationAPI/Helpers/Helper.cs

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+using System;
+
+namespace CarParkValidationAPI.Helpers;
+
+public class Helper
+{
+    public static string DateToStr(DateTime? date)
+    {
+        string result = "";
+        if (date != null)
+          result  = date?.ToString("yyyy-MM-dd");
+        return result;
+    }
+
+    public static DateTime StrToDate(string date)
+    {
+        DateTime result = DateTime.Today;
+        if (DateTime.TryParse(date, out var dt))
+        {
+            result = dt;
+        }
+        return result;
+    }
+    
+}