troubleshooting Question

File Sharing between two processes - one C and one C#

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ronron771 asked on
C#
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I have two programs running on windows. Program A is written in C. Program B is written in managed C#.

Program A:
(1) opens a file:
_fsopen(szFileName, "w", _SH_DENYNO);
(2) writes data to this file.

Program B should open and read this file simultaneously while program B writes to it. Program B tries to open the file like this:
fs = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read);
This line throws the exception:
"The process cannot access the file because it is being used by another process"

What is wrong? I could I fix that?
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