Now it works reading in different transactionsheets from excel

WinFormDi.BLI/IExcellent.cs

@@ -0,0 +1,13 @@
+namespace WinFormDiApp.BLR
+{
+    public interface IExcellent
+    {
+        int Columns { get; set; }
+        string DataType { get; set; }
+        int Rows { get; set; }
+
+        void Dispose();
+        void ExcellentStart(string path, int Sheet);
+        string ReadCell(int i, int j);
+    }
+}