BinaryReader not returning anything

I'm trying to write "test" to the memory stream and print it but nothing shows up. Here what my code looks like:

     var memStream : MemoryStream = new MemoryStream();
     var writer : BinaryWriter = new BinaryWriter(memStream);
 
     writer.Write("test");
     
     // Create the reader using the same MemoryStream  
     // as used with the writer.
     var binReader : BinaryReader = new BinaryReader(memStream);
 
     // Set Position to the beginning of the stream.
     memStream.Position = 0;
 
     // Read the data from memory and write it to the console.
     print(binReader.ReadString());
     
     writer.Close();
     memStream.Close();
     binReader.Close();