C# using the || operator - What am I doing wrong?

Question

C++ / C#

There is an array with a certain number X. If X is not two or three, execute the branch in if, otherwise - else.
What is the problem: if I leave one check (without or), we only allow "not two" - everything works as it should.
If with || - the if branch is always executed, the else cannot be entered even if X = 2 or 3.
if (arr[1] != 3 || arr[1] != 2)
{
Console.Write("The number is neither two nor three" );
}
else
{
Console.Write("Hit Else");
}

Answer 1

You misunderstand the meaning of ||.
You write, literally, "if x is not 2 or x is not 3", which of course is always true.
In this case, && should be used.

Answer 2

It is necessary to use AND, not OR, and you get "The number is not two OR not three", that is, it is always true.