C# How to program X-Axis on Controller.

This is what I have right now, but I'm really not sure what it should actually look like, I can't find example code or anything like that anywhere.

  var h : float = Input.GetAxisRaw("Xbox_Joystick_X-Axis");
  var xPos : float = h * range;
  transform.position = new Vector3(xPos, 2f, 0);
  
  if(Input.GetKey("a") || Input.GetKey("left")||xPos < 0){
      if(rigidbody.velocity.x > 0){
          rigidbody.velocity.x = 0;
      }
      if(rigidbody.velocity.x > -walkSpeed){
          rigidbody.velocity.x -= 48*Time.deltaTime;
      }
  }
  //if the player pressed D, add velocity to move right.
  if(Input.GetKey("d")|| Input.GetKey("right")||xPos > 0){
      if(rigidbody.velocity.x < 0){
          rigidbody.velocity.x = 0;
      }
      if(rigidbody.velocity.x < walkSpeed){
          rigidbody.velocity.x += 48*Time.deltaTime;
      }
  }