Not sure what this is called, anonymous tuple?

anonTuple.cs

// I want to be able to do this in C#

int a = 4;
int b = 2;

(a, b) = (b, a); // swap values

// ... and used in some terribly named methods...

public void AssignValues()
{
    var (id, name) = GetValues();
    // more statements
}

public int, string GetValues()
{
    return (123, "gist");
}