Why class filestream is considered as a trojan virus? What to do?

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C#

Windows

form

Hello!

Because of this class "FileStream" my application is considered as a trojan and eliminated by the antivirus, but it is not at all. What to do? Really thanks in advance.

See the code as follow: (it is c# in a windows form app)

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FtpWebResponse response = (FtpWebResponse)request.GetResponse();

Stream responseStream = response.GetResponseStream();
byte[] buffer = new byte[2048];

FileStream filestreaming = new FileStream(installation_dir + filename, FileMode.Create);

int ReadCount = responseStream.Read(buffer, 0, buffer.Length);
percentComplete = 0;

while (ReadCount > 0)
{
    filestreaming.Write(buffer, 0, ReadCount);
    ReadCount = responseStream.Read(buffer, 0, buffer.Length);

    percentComplete = (int)Math.Round((double)(100 * (filestreaming.Length)) / size);


}

response.Close();
filestreaming.Close();
responseStream.Close();

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What I have tried:

I tried to comment the line and it works fine, the antivirus is quiet. This is the proof that the antivirus doesn't like FileStream class...