File share error

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Hello

I prepared a software in C# for reading and writing files which are used to communicate with my expert advisor. This is a sampple code part:

f = new FileStream ( "ExpertSave.txt", FileMode .Open, FileAccess .Read, FileShare .None);

if (f.CanRead)

{

StreamReader S = new StreamReader (f);

int CurrentState = 0; //1=General, 2=Trades,3=TradeErrors,4=Hirarchy,5=HirarchyErrors

PrevPassWord = PassWord; //Check if password is changed;

PrevChannelID = ChannelID;

PrevVer = Version;

.

.

.

S.Close();

f.Close();

}

FileStream fs3 = new FileStream ( "Errors.txt", FileMode .Create, FileAccess .Write, FileShare .None);

StreamWriter f3 = new StreamWriter (fs3);

f3.WriteLine(MSG );

f3.Close();

fs3.Close();

and this is a sample mql code:

int ProxySave=FileOpen("ProxySave.txt",FILE_READ|FILE_CSV );
if(ProxySave!=-1)
{
Txt=FileReadString(ProxySave);//##General
Txt=FileReadString(ProxySave);
RandomNumber=StrToInteger(Txt);
.

.

.

}

in most computers there is no error, but in compute of one of clients, we get this error and then metatrader halts:

The process cannot access the file 'D:\program files\FIBO Group main\experts\files\ExpertSave.txt' because it is being used by another process.
Object reference not set to an instance of an object

I should add, in this special case, even using FileShare .Read or FileShare .Write also gives the same result.

Could you please advise?

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