Asking a Generic Method to Throw Specific Exception Type on FAIL

Question

Right, I know I am totally going to look an idiot with this one, but my brain is just not kicking in to gear this morning.

I want to have a method where I can sa

Answer 1

I have been instantiating inline the type of exception I want to throw, like this:

if (ItemNameIsValid(ItemName, out errorMessage))
    throw new KeyNotFoundException("Invalid name '" + ItemName + "': " + errorMessage);
if (null == MyArgument)
    throw new ArgumentNullException("MyArgument is null");