//contraconvariance
public static X_base incrA(X_base obj)
{
Y_child temp = new Y_child();
temp.val = obj.val + 10;
return(temp);
}
//convariance
public static Y_child incrB(Y_child obj)
{
Y_child temp = new Y_child();
temp.val = obj.val + 1;
return(temp);
}
public static void tryContraVariance()
{
Y_child y = new Y_child();
changeIt ci = ContraVariance.incrA;
y.val = 100;
y.a = 500;
Y_child Y = (Y_child)ci(y);
Console.WriteLine(y.val);
changeIt2 ci2 = ContraVariance.incrB;
}