lock rotation on object in unity code example

Example 1: unity how to lock rotation

public float lockPos;

	void Update()
	{
		// Locks the rotation.
		transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles.x, lockPos, lockPos);
	}

Example 2: unity how to change rotation

transform.eulerAngles = new Vector3(0f, 180f, 0f); //rotates 180 degrees