Converting a javascript to C#

Would anyone be so kind as to help me convert this script to c#?

 var cols:int = 4;
 var rows:int = 4;
 var totalCards:int = cols*rows;
 var matchesNeededToWin:int = totalCards * 0.5;
 var matchesMade:int = 0;
 var cardW:int = 100;
 var cardH:int = 100;
 var aCards:Array;
 var aGrid:Array;
 var aCardsFlipped:ArrayList;
 var playerCanClick:boolean;
 var playerHasWon:boolean = false;
 
 
 function Start()
 {
     playerCanClick = true;
     aCards = new Array();
     aGrid = new Array();
     aCardsFlipped = new ArrayList();
     for(i=0; i<rows; i++)
     {
     aGrid[i] = new Array();
     for(j=0; j<cols; j++)
     {
     aGrid[i][j] = new Card();
     }
     }
 }
 
 function OnGUI () 
 {
     GUILayout.BeginArea (Rect (0,0,Screen.width,Screen.height));
     BuildGrid();
     GUILayout.EndArea();
     print("building grid!");
 }
 
 function BuildGrid()
 {
 GUILayout.BeginVertical();
 for(i=0; i<rows; i++)
 {
 GUILayout.BeginHorizontal();
 for(j=0; j<cols; j++)
 {
 var card:Object = aGrid[i][j];
 if(GUILayout.Button(Resources.Load(card.img),
 GUILayout.Width(cardW)))
 {
 Debug.Log(card.img);
 }
 }
 GUILayout.EndHorizontal();
 }
 GUILayout.EndVertical();
 }
 
 class Card extends System.Object
 {
     var isFaceUp:boolean = false;
     var isMatched:boolean = false;
     var img:String;
 function Card()
 {
 img = "robot";
 }
 }