Level Boss Random Movements

I'm working on level boss movements for a while. I was stucked with a problem that swaping new position when arrive current position. So, i solve the problem with some help on gamedev web site.

First i need a class which holds the position information.

   public class BossMovement  
   {  
     public Vector2 pos { get; set; }  
     public float speed { get; set; }  
     public float waitTime { get; set; }  
     public BossMovement(Vector2 pPos, float pSpeed, float pWaitTime)  
     {  
       pos = pPos;  
       speed = pSpeed;  
       waitTime = pWaitTime;  
     }  
   }  

And generate positions.

      List<BossMovement> movements = new List<BossMovement>();  
      movements.Add(new BossMovement(new Vector2(300f, 200f), 10f, 4f));        
      movements.Add(new BossMovement(new Vector2(50f, 200f), 7f, 6f));   
      movements.Add(new BossMovement(new Vector2(50f, 400f), 5f, 6f));   
      movements.Add(new BossMovement(new Vector2(300f, 350f), 10f, 6f));   
      movements.Add(new BossMovement(new Vector2(300f, -32f), 10f, 6f));   
      movements.Add(new BossMovement(new Vector2(50f, 32f), 8f, 6f));   

So, i can manage movements.

   public override void Update(GameTime gameTime)  
     {  
       if (!IsNasted)  
       { 
         //Wait for a while
         if (waitTime > 0)  
         { 
 
           waitTime = Math.Max(0.0f, waitTime - Scene.Elapsed);  
           if (waitTime <= 0.0f)  
           {  
             waitTime = 0f;              
           }  
         }  
         else  
         { 
          //Is the sprite arrives the target position?
           if (Vector2.Distance(ConvertUnits.ToDisplayUnits(movements[minx].pos), ConvertUnits.ToDisplayUnits(body.Position)) < 50)  
           {  
             //Change the current position index
             waitTime = movements[minx].waitTime;  
             if (minx == movements.Count - 1)  
               minx = 0;  
             else  
               minx++;  
             //Stop the movement
             body.LinearVelocity = Vector2.Zero;  
           }  
           else  
           {             
             //Move the boss to the specific position 
             Vector2 v = (ConvertUnits.ToDisplayUnits(movements[minx].pos) - ConvertUnits.ToDisplayUnits(body.Position));  
             v.Normalize();  
             body.LinearVelocity = ConvertUnits.ToSimUnits(v * (movements[minx].speed * (float)gameTime.ElapsedGameTime.TotalMilliseconds) );  
           }  
         }  
       }  
       base.Update(gameTime);  
     }