Equality comparison between multiple variables

Question

I\'ve a situation where I need to check whether multiple variables are having same data such as

var x=1;
var y=1;
var z=1;

I want to check

Answer 1

Add this extension:

public static class Extensions
{
    public static bool EqualsAll(this T subject, params T[] values) =>
        values == null || values.Length == 0 || values.All(v => v.Equals(subject));
}

Then call it like so:

if(1.EqualsAll(x, y, z))