Исправил

Bulldozer/Bulldozer/DirectionBulldozer.cs

@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Bulldozer
 {
-    public enum DirectionType
+    public enum DirectionTypeBulldozer
     {
         Up = 1,
 

Bulldozer/Bulldozer/DrawningBulldozer.cs

@@ -68,17 +68,19 @@ namespace Bulldozer
         /// <param name="y">Координата Y</param>
         public void SetPosition(int x, int y)
         {
-            if (x <= _pictureWidth - bulldozerWidth && y <= _pictureHeight - bulldozerHeight)
+            if (x < 0 || y < 0 || x + bulldozerWidth > _pictureWidth || y + bulldozerHeight > _pictureHeight)
             {
-                _startPosX = x;
+                x = 10;
-                _startPosY = y;
+                y = 10;
             }
+            _startPosX = x;
+            _startPosY = y;
         }
         /// <summary>
         /// Изменение направления перемещения
         /// </summary>
         /// <param name="direction">Направление</param>
-        public void MoveTransport(DirectionType direction)
+        public void MoveTransport(DirectionTypeBulldozer direction)
         {
             if (EntityBulldozer == null)
 
@@ -88,7 +90,7 @@ namespace Bulldozer
             switch (direction)
             {
                 //влево
-                case DirectionType.Left:
+                case DirectionTypeBulldozer.Left:
                     if (_startPosX - EntityBulldozer.Step > 0)
                     {
                         _startPosX -= (int)EntityBulldozer.Step;
@@ -99,7 +101,7 @@ namespace Bulldozer
                     }
                     break;
                 //вверх
-                case DirectionType.Up:
+                case DirectionTypeBulldozer.Up:
                     if (_startPosY - EntityBulldozer.Step > 0)
                     {
                         _startPosY -= (int)EntityBulldozer.Step;
@@ -110,7 +112,7 @@ namespace Bulldozer
                     }
                     break;
                 // вправо
-                case DirectionType.Right:
+                case DirectionTypeBulldozer.Right:
                     if (_startPosX + EntityBulldozer.Step + bulldozerWidth < _pictureWidth)
                     {
                         _startPosX += (int)EntityBulldozer.Step;
@@ -121,7 +123,7 @@ namespace Bulldozer
                     }
                     break;
                 //вниз
-                case DirectionType.Down:
+                case DirectionTypeBulldozer.Down:
                     if (_startPosY + EntityBulldozer.Step + bulldozerHeight < _pictureHeight)
                     {
                         _startPosY += (int)EntityBulldozer.Step;

Bulldozer/Bulldozer/FormBulldozer.cs

@@ -31,16 +31,16 @@ namespace Bulldozer
             switch (name)
             {
                 case "buttonUp":
-                    _drawningBulldozer.MoveTransport(DirectionType.Up);
+                    _drawningBulldozer.MoveTransport(DirectionTypeBulldozer.Up);
                     break;
                 case "buttonDown":
-                    _drawningBulldozer.MoveTransport(DirectionType.Down);
+                    _drawningBulldozer.MoveTransport(DirectionTypeBulldozer.Down);
                     break;
                 case "buttonLeft":
-                    _drawningBulldozer.MoveTransport(DirectionType.Left);
+                    _drawningBulldozer.MoveTransport(DirectionTypeBulldozer.Left);
                     break;
                 case "buttonRight":
-                    _drawningBulldozer.MoveTransport(DirectionType.Right);
+                    _drawningBulldozer.MoveTransport(DirectionTypeBulldozer.Right);
                     break;
             }
             Draw();