CreateFileMapping returns null.

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C#

Sorry for my English.

I want to create map file. I found an example at the code project. But in use that example show me some fails:

IntPtr m_pMapFile;
IntPtr m_pBuff;

string data = "TestTest";

// create map file
m_pMapFile = WinCE.CreateFileMapping(WinCEConst.INVALID_HANDLE_VALUE, null, WinCEConst.PAGE_READWRITE, 0, MapSize, MapName);

After compiling, variable m_pMapFile takes the value 0.

// get map file
m_pBuff = WinCE.MapViewOfFile(m_pMapFile, WinCEConst.FILE_MAP_ALL_ACCESS, 0, 0, MapSize);

Then variable m_pBuff takes the value 0.

What's the problem?