throwing an exception if an object is null

Question

I've recently discovered that:

if (Foo() != null)    
   { mymethod(); }

can be rewritten as

Foo?.mymethod()

Can the following be rewritten in a similar fashion?

if (Foo == null)
{ throw new Exception()}

Answer 1

As of .NET 6 framework you can use the following ThrowIfNull static Method:

void HelloWorld(string argumentOne)
{
    ArgumentNullException.ThrowIfNull(argumentOne);
    Console.WriteLine($"Hello {argumentOne}");
}