Mouse follow collider in a 2D game

In my game I have a code thath allows me to drag a specific block around with the mouse as long as i hold the mouse button down my problem now is thath the block doesnt collide withother blocks while draging anyone has an idea on how to solve that heres the code im using:

         void OnMouseDrag()
         {
             Vector3 point = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,(transform.position.z-Camera.main.transform.position.z)));
             point.z = transform.position.z;
             transform.position = point;
         }