Listbox items text and text boxes?

[Derek275]

Ok, I have I have a list box, kryptonListBox1, and a text box textBoxX1. I want to get the selected item in the listbox's text into the text box. My code is:

textBoxX1.Text = kryptonListBox1.SelectedItem.ToString

I've tried using .Text.ToString, but with both I get the error 'Object reference not set to instance of an object'

What am I doing wrong and what's the easiest way to fix it?