Public ReadOnly Property FileName As String

public string FileName {get;}

using(TempFile tempFile = new TempFile())
{
    FileStreamFactory factory = new FileStreamFactory(tempFile.TempPath, FileMode.Create, FileAccess.ReadWrite, FileShare.None, 1024, FileOptions.Asynchronous);
    Assert.AreEqual(tempFile.TempPath, factory.FileName);
    using (FileStream s = (FileStream)factory.Create())
        Assert.IsTrue(s.CanRead && s.CanWrite && s.IsAsync);
}

Using tempFile As New TempFile()
    Dim factory As New FileStreamFactory(tempFile.TempPath, FileMode.Create, FileAccess.ReadWrite, FileShare.None, 1024, FileOptions.Asynchronous)
    Assert.AreEqual(tempFile.TempPath, factory.FileName)
    Using s As FileStream = DirectCast(factory.Create(), FileStream)
        Assert.IsTrue(s.CanRead AndAlso s.CanWrite AndAlso s.IsAsync)
    End Using
End Using