General :: Busybox Dd Command Not Working?

I'm currently working on a project which involves imaging Android phones - specifically, the program I've written is mean to automate identifying the memory block containing the userdata and then using the following sequence of commands (using Android Debug Bridge) to copy it to the computer that the phone is connected to:

Code:
adb forward tcp:5555 tcp:5555
adb shell
busybox nc –l –p 5555 –e dd if=/dev/mtd/mtd[mtd block number] bs=4096

This is done in command prompt and then you have to manually open another command prompt and type in:

Code:

adb forward tcp:5555 tcp:5555
nc 127.0.0.1 5555 | dd of=[chosen file name].bin bs=4096 -- progress

This copies the memory block over without any problems when done manually and even shows you in real time how much data has been transferred.The problem I have is with automating the process in C#. Specifically, I can get every stage of it to work through using a process to write the commands to standard input and using a tcp listening port to receive the data. Apart from this crucial element of the process:

Code:
adb shell "busybox nc –l –p 5555 –e dd if=/dev/mtd/mtd[mtd block number] bs=4096"

For some reason, no matter how I try to phrase it or do it, C# hates that command and won't execute it. I can manually type the exact same thing into the command prompt and it works fine but trying to do it in C# just leads to busybox acting as though I typed the command in incorrectly - this is what it gives me:

Code:

BusyBox v1.15.2 <2009-11-27 10:38:30 GMT> multi-call binary

Usage: nc [-in] [-wN] [-l] [-p Port] [-f FILENAME|PADDR PORT] [-e PROG]

Open a pipe to IP:port or file[code]....

At the moment I'm using a script to send the commands to the command prompt but that's a kludge that I'd really prefer not to have to use.