Do we have use of pointer in C# if so how

>>It's my understanding that EVERYTHING is a pointer by default in C#
Classes are reference types, and in .NET a reference stands for a "managed pointer". Garbage collector has information about object references in stack memory, and uses them to keep alive or delete objects located in heap memory.

Structs however (and all other value types), are not reference types, and they got no managed pointer in similar meaning. Value types are located directly in stack memory, and CRL deletes them from there.

>>You can use the "ref" keywork to use references. That's not exactly the same thing as pointers, but as I know it's the closest form that C# allows.
Thats not quite true. You can indeed override the garbage colletion mechanism, and use POINTERS directly in your C# program. The pointers have similar syntax than in C++, *, & and so on. You must wrap pointer handling code inside the unsafe block. But pointers are seldom if never needed in C# programs, since using pointers does wreck the whole idea of safe and automatic garbage collection, don't you think?

I myself would not recommend the direct use of pointers in C#. Only situations when you ever would need them, would be the use of C-generic dll's and hard-core code optimization. Optimization with pointers still requires you yourself to handle the memory management! Writing a good code without pointers and with good algorithms is better than risky unmanaged memory. Managed code indeed stands for that someone (CLR) manages the memory for you.

You can use the "ref" keywork to use references. That's not exactly the same thing as pointers, but as I know it's the closest form that C# allows.
Simon