Return a random value

Build a piece of code in c# language : (method/function) Which returns a random value between 1 & 6 except those numbers which are passed at the time of calling.

Just as . . .

//Definition

Private int rdm (int [] )
{


return int
}

//calling

rdm(new int {3,5} )

//output
4
Or
2
Or
6
Or
1