What I believe is the olderest, marked as 'AdvertsingProfitControl Alpha' by the folder. Only had a simple 'Add Records' form, quite incomplete.

AdvertsingProfitControl/Program.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Windows.Forms;
+
+namespace AdvertsingProfitControl
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new frmMain());
+        }
+    }
+}