Timeout exception when writing to virtual COM

I am trying to write to a COM port using .NET sample

I have no problem writing to real COM, but when I try to write to virtual COM I get a timeout exception

Unhandled Exception: System.TimeoutException: Recording timed out. at System.IO.Ports.SerialStream.Write (Byte [] array, Int32 offset, Int32 count, Int32 timeout) at System.IO.Ports.SerialPort.Write (line text) at System.IO.Ports.SerialPort.WriteLine ( line text)

I searched for this issue and found this . according to what said this is the problem:

Function

.net write () uses CreateFile and WriteFile Async like this:

CreateFile("\\\\.\\" + portName,
            NativeMethods.GENERIC_READ | NativeMethods.GENERIC_WRITE,
            0,    // comm devices must be opened w/exclusive-access
            IntPtr.Zero, // no security attributes
            UnsafeNativeMethods.OPEN_EXISTING, // comm devices must use OPEN_EXISTING
            FILE_FLAG_OVERLAPPED,
            IntPtr.Zero  // hTemplate must be NULL for comm devices
            );

WriteFile(_handle, p + offset, count, IntPtr.Zero, overlapped);

      

        
        
        
      

    

when i used the ones that had NULL instead of FILE_FLAG_OVERLAPPE

My question is, how can I solve this problem? do i need to write my own code?