I use switch in if...it desn't work

 switch(value)
 {
 case GameState.BACK:
         zPos += 0.5*dt;
     xPos = 0.169907;
     
     mainCamera.rigidbody.transform.position = Vector3(xPos,2.6398,zPos);
     EventFishPlay("dance");
 break;
 case GameState.START:
         leftPos = xPos + Range;
     rightFos = xPos - Range;
     ang = Mathf.Cos((Time.time)*0.01 * 2.0*Mathf.PI)*0.5+0.5;
     EventFishPlay("attack");
     mainCamera.rigidbody.transform.position = Vector3(leftPos * ang + rightFos*(1-ang),2.6398,2.122922);
             
     whalenani.transform.position.z = 200;
     sharkani.transform.position.z = 200;
     fursealani[1].transform.position.z = 200;
     fursealani[1].transform.position.y = 3;
     fursealani[0].transform.position.z = 200;
     FishMove(dt);
 break;
         
 case GameState.EVENT2:
     var zPos : float;
     var yPos : float;
     var ElipeTime :float = Time.deltaTime*10;
     zPos=mainCamera.transform.transform.position.z;
     yPos=mainCamera.transform.transform.position.y;
 
         
     zPos -= 0.5*dt;
     xPos = 0.169907;
     //here        
     if(zPos <= -7){
             zPos=-7;
         State = GameState.EVENT2;
     }
     if(whalenani.transform.position.x>=22){
         State = GameState.BACK;
     }
     mainCamera.rigidbody.transform.position = Vector3(xPos,2.6398,zPos);
     EventFishPlay("dance");    
 break;
     
 }

case, if unable to use the inside? only outside??

Blockquote