Regarding C# pointers

These are also very good articles on using pointers in C# which can only be done in code marked as 'unsafe':

http://www.c-sharpcorner.com/UploadFile/PatrickSmacchia/CSharp2UnsafeCode02162006063859AM/CSharp2UnsafeCode.aspx

http://www.c-sharpcorner.com/UploadFile/pcurnow/usingpointers10022007082330AM/usingpointers.aspx

Adding two more links from msdn...

http://msdn.microsoft.com/en-us/library/aa288474(v=vs.71).aspx
http://msdn.microsoft.com/en-us/library/y31yhkeb(v=vs.80).aspx

go through below link where you can know what is need for pointers and why

http://www.c-sharpcorner.com/UploadFile/rajeshvs/PointersInCSharp11112005051624AM/
PointersInCSharp.aspx