How x = {0} turned into x = 10 ?

Question

I am just new to this and can't get this point clearly. Someone help

Answer 1

you did not explain in your question the other variables which is object;
by the way in first x about to get the first value of object. and the second x is the result of the number of value the object chose to get..

Answer 2

What if I write int x = 10;
And then
Console.WriteLine(x = {0});
Then the result is x = 10
How ?