JS to C# conversion Problem

I was wanting to convert a js script over to C# and for the most part its done but I have one line giving me problems please help.

 using UnityEngine;
 using System.Collections;
 
 public class Lightning : MonoBehaviour {
 
 public GameObject target;
 public LineRenderer LR;
 public double arcLength = 2.0;
 public double arcVariation = 2.0;
 public double inaccuracy = 1.0;
 
 void Update()
 {
 
 Vector3 lastPoint = transform.position;
 
 int i = 1;
 
 LR.SetPosition(0, transform.position);//make the origin of the LR the same as the transform   
  while (Vector3.Distance(target.transform.position, lastPoint) >.5) 
  {//was the last arc not touching the target?            
  LR.SetVertexCount(i + 1);//then we need a new vertex in our line renderer          
  public fwd = target.transform.position - lastPoint;//gives the direction to our target from the end of the last arc20.         
  fwd.Normalize();//makes the direction to scale         
  fwd = Randomize(fwd, inaccuracy);//we don't want a straight line to the target though      
  fwd *= Random.Range(arcLength * arcVariation, arcLength);//nature is never too uniform    
  fwd += lastPoint;//point + distance * direction = new point. this is where our new arc ends     
  LR.SetPosition(i, fwd);//this tells the line renderer where to draw to25.         
  i++;         
  lastPoint = fwd;//so we know where we are starting from for the next arc        
  }
  }

The line with the problem is

 public fwd = target.transform.position - lastPoint;//gives the direction to our target from the end of the last arc20.

If needed I can post the js version I was working from.