Within a C# instance method, can 'this' ever be null?

Question

I have a situation where very rarely a Queue of Objects is dequeuing a null. The only call to Enqueue is within the class itself:

m_DeltaQueue.Enqueue(this);         


        

Answer 1

(Slightly off-topic and a highly unlikely possibility; have made this community wiki. The real question has already been resolved; this is mainly related to the title of the question.)

In theory, if your code m_DeltaQueue.Enqueue(this) resulted in the invocation of an implicit conversion operator on the argument, that could indeed result in a null-reference being passed to the method.

class Foo
{
    public static implicit operator string(Foo foo)
    {
        return null;
    }

    void InstanceMethod()
    {
        string @this = this;

        if (@this == null)
            Console.WriteLine("Appears like 'this' is null.");
    }

    static void Main()
    {
        new Foo().InstanceMethod();
    }
}