Blazor webassembly with radzen setup

Services/DataLoader.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using BatteryCostAnalysis.Models;
+
+namespace BatteryCostAnalysis.Services
+{
+    public class DataLoader
+    {
+        public static List<EnergyData> LoadAndProcessData(string filePath)
+        {
+            var energyData = new List<EnergyData>();
+            var lines = File.ReadAllLines(filePath).Skip(1); // Skip header
+            
+            foreach (var line in lines)
+            {
+                var parts = line.Split(';');
+                if (parts.Length < 9) continue;
+                
+                var date = DateTime.Parse(parts[0], new CultureInfo("nl-BE"));
+                var register = parts[7].Trim();
+                var volumeStr = parts[8].Trim();
+                var volume = string.IsNullOrEmpty(volumeStr) ? 0 : double.Parse(volumeStr.Replace(",", "."), CultureInfo.InvariantCulture);
+                
+                var existing = energyData.FirstOrDefault(e => e.Date == date);
+                if (existing == null)
+                {
+                    existing = new EnergyData { Date = date };
+                    energyData.Add(existing);
+                }
+                
+                switch (register)
+                {
+                    case "Afname Dag":
+                        existing.DayConsumption = volume;
+                        break;
+                    case "Afname Nacht":
+                        existing.NightConsumption = volume;
+                        break;
+                    case "Injectie Dag":
+                        existing.DayProduction = volume;
+                        break;
+                    case "Injectie Nacht":
+                        existing.NightProduction = volume;
+                        break;
+                }
+            }
+            
+            return energyData;
+        }
+    }
+}