Commented by: @cincuranet

1. FirebirdSql.Data.Client.Gds.XdrStream

public XdrStream(Stream innerStream, Charset charset) : base()
{
this.buffer = new byte[8] { 0, 0, 0, 0, 0, 0, 0, 0 };
this.innerStream = innerStream;
this.charset = charset;

// !!! posible is no need
// GC.SuppressFinalize(innerStream);
}

if GC suppressed innerStream - the XdrStream is not disposed!!!

Commented by: @cincuranet

The innerStream is later closed (and so resources are freed) in XdrStream.Close method.