Elegant check for null and exit in C#

Question

What is an elegant way of writing this?

if (lastSelection != null)
{
    lastSelection.changeColor();
}
else
{
    MessageBox.Show("No Selection Made");
    return;
}

changeColor() is a void function and the function that is running the above code is a void function as well.

Answer 1

You can reduce clutter by reversing the condition:

if (lastSelection == null)
{
    MessageBox.Show("No Selection Made");
    return;
}

lastSelection.changeColor();