Question

In C#, I have a 2d array of labels who’s image I want to change depending on conditions. More specifically, I’d like to get it toggle between a given image and no image at all (turning it into a transparent label) and back again when conditions are met. Currently, to wipe the label clear again, I’m using this:

someLabelArray[i][j].Image = null;

But it always throws a Null Reference Exception, which makes me suspect this isn’t the ‘right’ way to do things. Or perhaps I’m misunderstanding the error? Is there a better way to do this?

Answer 1

I suspect that would be absolutely fine – but that either someLabelArray is null, or someLabelArray[i] is null for whatever value of i you’re using.

Simple way to test this: change your code to:

someLabelArray[i][j].Text = "foo";

which obviously has nothing to do with images, and will definitely work if your array is okay. I suspect this will fail in the same way, in which case you need to look carefully at how you’re constructing your array.

If this works – well, I’ll have another look then 🙂