Now it works reading in different transactionsheets from excel

WinFormDi.BLR/Excellent.cs

@@ -0,0 +1,69 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Office.Interop.Excel;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using _Excel = Microsoft.Office.Interop.Excel;
+
+namespace WinFormDiApp.BLR;
+
+public class Excellent : IDisposable, IExcellent
+{
+
+    public Excellent(ILogger<Excellent> logger)
+    {
+        _logger = logger;
+    }
+
+    string path = string.Empty;
+    _Application excel = new Application();
+    Workbook wb;
+    Worksheet ws;
+    private readonly ILogger<Excellent> _logger;
+
+    public int Columns { get; set; }
+    public int Rows { get; set; }
+
+    public string DataType { get; set; }
+
+    public void ExcellentStart(string path, int Sheet)
+    {
+        if (wb != null)
+        {
+            wb.Close();
+        }
+        this.path = path;
+        wb = excel.Workbooks.Open(path);
+        ws = wb.Worksheets[Sheet];
+        _Excel.Range usedRange = ws.UsedRange;
+        Columns = usedRange.Columns.Count;
+        Rows = usedRange.Rows.Count;
+    }
+
+    public string ReadCell(int i, int j)
+    {
+        i++;
+        j++;
+        if (ws.Cells[i, j].Value2 != null)
+        {
+            _Excel.Range cell = ws.Cells[i, j];
+            object value = cell.get_Value(Type.Missing);
+            if (value != null)
+            {
+                Type type = value.GetType();
+                DataType = type.Name;
+                //Console.WriteLine($"Cell ({i},{j}) contains value of type {DataType}");
+            }
+            return Convert.ToString(ws.Cells[i, j].Value2);
+        }
+        return string.Empty;
+    }
+
+    public void Dispose()
+    {
+        excel.Workbooks.Close();
+    }
+}
+