Rotate function on c#

I want to do a Rotate function on c#.I try use transform.rotate neither java script,but i want to use get axis.What i can do?

 I try: input = new Vector3(Rotate)(Input.GetAxis(rotate1),0,0)* velocity;
             rigidbody.velocity = input;
 I try:input = transfrom.translate(Input.GetAxis(rotate1),0,0)* velocity;
             rigidbody.velocity = input;
 I try:input = new Vector3 transform.translate(Input.GetAxis(rotate1),0,0)* velocity;
             rigidbody.velocity = input;

HELP PLEASE