Question

here I created the variable appointment of type Pair<Pair <int, int>, String> I would like to create a value of this type and assign it to appointment.

Could somebody help me?
I am new to C# and programming.

Pair< Pair<int, int>, String> appointment = new Pair<Pair<int,int>,String>; 

Answer 1

Assuming that Pair has a constructor with two arguments

Pair<Pair<int,int>,string> appointment = new Pair<Pair<int,int>,string>(
    new Pair<int,int>(x, y),
    "hello"
);

or more concise

var appointment = new Pair<Pair<int,int>,string>(
    new Pair<int,int>(x, y),
    "hello"
);

or with object initializers (assuming Pair has two properties named Arg1 and Arg2)

var appointment = new Pair<Pair<int,int>,string> {
    Arg1 = new Pair<int,int> { Arg1 = x, Arg2 = y),
    Arg2 = "hello"
};

or if you want to create an empty Pair

var appointment = new Pair<Pair<int,int>,string>();