How to access random item in list?

Question

Create an instance of Random class somewhere. Note that it’s pretty important not to create a new instance each time you need a random number. You should reuse the old instance to achieve uniformity in the generated numbers. You can have a static field somewhere (be careful about thread safety issues):
```
static Random rnd = new Random();
```
Ask the Random instance to give you a random number with the maximum of the number of items in the ArrayList:
```
int r = rnd.Next(list.Count);
```
Display the string:
```
MessageBox.Show((string)list[r]);
```