I am converting code from Java to C#, but having issues figuring out some keyword equivalence. I have looked over the web and can't find anything. Updated added number 3.

1) Does anyone know what C# uses for charAt()? Below is how I am trying to use it.

```
 curr = tokens[i].charAt(0);

```

2) Also having issues converting isEmpty() to C# syntax.

```
 if (par.isEmpty())

```

3) How should I convert this:

```
op2 = compute.pop().intValue();

```

Thanks!