What does this mean(Generics)

Hello!

It says "Another limitation that you need to be aware of is that using the
operator == and != are
only permitted when comparing a value of a type supplied to a generic type
to null.
That is, the following code works.
Here if T is a value type then it is always assumed to be non-null, so in
the above
code Compare always return true;"

The question is what does they mean with the text saying "using the operator
== and != are
only permitted when comparing a value of a type supplied to a generic type
to null."

public bool Compare(T op1, T op2)
{
if (op1 != null && op2 != null)
{
return true;
}
else
{
return false;
}
}

//Tony


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