How to write a sample code that will crash and produce dump file?

Question

I started learned windbg and I found this good post How to use WinDbg to analyze the crash dump for VC++ application?

Now I want to follow the instructions and do it

Answer 1

Auto minidump generation is done by the post-mortem debugger, so you need to start there. Most importantly though, it's done by a debugger. So if you just want to generate a minidump, you can use your typical debugger (probably visual studio or windbg). Even task manager can create dump files.

The registry setting which specifies the post-mortem debugger is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug

Look at the Debugger string, and you will be on your way to finding your minidumps.