Dash Porblème

Hello, I explain you my problem, I would like to make a dash, I've watched several videos but I can't find a solution for my code (I dash when the time is not less than 0).

Code (CSharp):

1. void Update()
2.     {
3.         movement.x = Input.GetAxisRaw("Horizontal");
4.         movement.y = Input.GetAxisRaw("Vertical");
5.         LastDirection();
6.            
7.        
8.         if(Input.GetKeyDown(KeyCode.Space)){
9.             if(dashTime < 0){
10.                 Dash();
11.                 dashTime = Timetodash;
12.             }
13.         }
14.         dashTime -= Time.deltaTime;
15.        
16.     }

Code (CSharp):

1. void LastDirection()
2.     {
3.         if(Input.GetKeyDown(KeyCode.Z)){
4.             direction = 1;
5.         }else if(Input.GetKeyDown(KeyCode.Q)){
6.             direction = 2;
7.         }else if(Input.GetKeyDown(KeyCode.S)){
8.             direction = 3;
9.         }else if(Input.GetKeyDown(KeyCode.D)){
10.             direction = 4;
11.         }
12.     }

Code (CSharp):

1. void Dash()
2.     {
3.         if(direction == 1){
4.             transform.position += new Vector3(5,0,0);
5.         }else if(direction == 2){
6.            transform.position += new Vector3(0,5,0);
7.         }else if(direction == 3){
8.            transform.position += new Vector3(-5,0,0);
9.         }else if(direction == 4){
10.            transform.position += new Vector3(0,-5,0);
11.         }
12.     }

 

sorry i'm in the wrong forum