Wrap main in try catch

EtchBendLines/Program.cs

@@ -12,29 +12,52 @@ namespace EtchBendLines
         static Etcher etcher = new Etcher();
 
         static void Main(string[] args)
+        {
+            try
             {
                 var path = AppDomain.CurrentDomain.BaseDirectory;
                 var files = Directory.GetFiles(path, "*.dxf", SearchOption.AllDirectories);
 
-            etcher.EtchLength = double.Parse(ConfigurationManager.AppSettings["EtchLength"]);
-            etcher.MaxBendRadius = double.Parse(ConfigurationManager.AppSettings["MaxBendRadius"]);
+                etcher.EtchLength = GetAppSettingAsDouble("EtchLength");
+                etcher.MaxBendRadius = GetAppSettingAsDouble("MaxBendRadius");
 
                 if (files == null || files.Length == 0)
                 {
                     Console.WriteLine($"No DXF files founds. Place DXF files in \"{AppDomain.CurrentDomain.BaseDirectory}\" and run this program again.");
-                PressAnyKeyToExit();
-                return;
                 }
-
+                else
+                {
                     foreach (var file in files)
                     {
                         etcher.AddEtchLines(file);
                         Console.WriteLine();
                     }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.ForegroundColor = ConsoleColor.Red;
+                Console.WriteLine($"An error occured: {ex.Message}");
+                Console.ResetColor();
+            }
 
             PressAnyKeyToExit();
         }
 
+        static double GetAppSettingAsDouble(string name)
+        {
+            double v;
+
+            try
+            {
+                return double.Parse(ConfigurationManager.AppSettings[name]);
+            }
+            catch
+            {
+               throw new Exception($"Failed to convert the value of AppSetting[\"{name}\"] to double");
+            }
+        }
+
         static void PressAnyKeyToExit()
         {
             Console.WriteLine("Press any key to exit.");