moving in the direction of Camera on mouse click not working

hello this is my first post. I'm relatively new to unity and scripting and i've been trying to solve this problem
all day whenever I mouse click, my character doesn't move i'm using vector3.movetorwards I've tried using rigidbody.addforce, rigidbody.addrelativeforce, transform.translate, rigidbody.moveposition,. some help would be greatly appretiated here's my code: (the goal of this is to make the player move at a high speed on x, y, z based of the rotation of the camera)

using UnityEngine;
using System.Collections;
public class DashMechanic : MonoBehaviour
{
public float Dash_Speed;
public Transform Dash_Source;
public GameObject Dash_Initiation;
private bool DashIsNull;
private Vector3 Dash_Direction;
private GameObject Dash_Instance;
void Start ()
{
}
void Update ()
{
//sets the variable Dash_Direction to the position of Dash_Source.
Dash_Direction = new Vector3 (Dash_Source.position.x, Dash_Source.position.y, Dash_Source.position.z);
if (Input.GetMouseButtonUp (0))
{
Dash ();
}
if (Input.GetMouseButtonUp (1))
{
Dash ();
}
}
void Dash ()
{
if (DashIsNull == true)
{
// creates an instance of Dash_Initiation
Dash_Instance = Instantiate (Dash_Initiation, Dash_Source.position, Dash_Source.rotation) as GameObject;
}
// used to make sure theres only one instance of Dash_Initiation.
if (Dash_Instance == null)
DashIsNull = true;

else if(Dash_Instance == false)
{
GameObject.Destroy (Dash_Instance);
}
//moves the player.
Vector3.MoveTowards (transform.position, Dash_Direction, Dash_Speed * Time.deltaTime);
}
}