Executing commands in console via cmd.exe process stdin

Hi,

This is a bit of an unusual question; it doesn't relate to plugins but hopefully you can help with this issue.

I've written a VB.NET program which starts cmd.exe with the following arguments:
run.bat contains:
I then redirect the stdin and stdout to my application, which displays the output in a textbox as expected. However, when I write to the process' stdin, nothing...

Executing commands in console via cmd.exe process stdin