Auto marking unmarked mines when win

Field.cs

@@ -151,7 +151,7 @@
             }
             return false;
         }
-        public void OpenAll()
+        public void OpenAll(bool automark)
         {
             for (int i = 0; i < size; i++)
             {
@@ -159,7 +159,13 @@
                     opened.Add(cells[i]);
                 if (cells[i].IsMarked && !cells[i].IsMine)
                     cells[i].SetWrong();
+                if (automark && cells[i].IsMine)
+                {
+                    cells[i].Mark();
+                    nmines = 0;
+                }
             }
+            this.Draw();
         }
         public void Mark(int y, int x)
         {

Game.cs

@@ -14,11 +14,12 @@
             while (true)
             {
                 Console.Clear();
-                field.Draw();
                 if (field.Check())
                 {
+                    field.OpenAll(true);
                     return true;
                 }
+                field.Draw();
                 Console.Write("Enter your command: ");
                 try
                 {
@@ -29,7 +30,8 @@
                         int y = command[0].First() - 'A';
                         if (field.Open(y, x))
                         {
-                            this.Finish();
+                            Console.Clear();
+                            field.OpenAll(false);
                             return false;
                         }
                     }
@@ -55,11 +57,5 @@
                 }
             }
         }
-        private void Finish()
-        {
-            field.OpenAll();
-            Console.Clear();
-            field.Draw();
-        }
     }
 }