Hello! You just missed the syntax a little.
Instead of: > int delegate(int) dg = { value => return value + a + 3; }; You can write auto dg = (int value) { return value + a + 3; }; // Omitted return type, but had to specify type of value. or auto dg = (int value) => value + a + 3; // Notice no "return" keyword. or int delegate(int) dg = value => value + a + 3; // Omitted type of value, but had to write the full type of dg. You can also write a delegate as an inner function: int a = 7; int dg(int value) { return value + a + 3; } auto result = dg(123); I'm not sure, but I guess all of these should mean the same thing.