What does the symbol * after a type in C#?

Question

I'm new in C# and what I learned at school it's really poor. Last week I came to the same problem, I didn't know what the ? means after a name type in C#. I could find the answer, then again what does "??" means in a expression, I'm really frustrated.

In this case the star (*) what is telling me about the incoming parameter? (I'm into an unsafe code block)

I'll really thanked if you give me some quick guides about this things in C#.

Answer 1

* after a type determines a pointer. There's a good chance that you may never even need to use this.

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? after a type says that it is nullable. See below:

int? a = null;
int b = null; //Compile error

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?? is the null coalescing operator. Basically it will give you the right-hand side value if the left-hand side is null.

object a = null;
object b = new Object();
object c = a ?? b;
// 'c' is 'b' because 'a' was null.

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I hope that answers your questions. I couldn't tell if you were asking about all of these or only the *.

Answer 2

'*' means that it is a pointer, much liker pointers in C. You will very rarely encounter these in C# code.

Answer 3

that's how you can declare pointer type, you better read Pointer types (C# Programming Guide)

Pointers are In an unsafe context