I need some help with System.Net.Sockets.

I'm trying to convert this code that was written in Visual Basic 6.0 to Visual Basic Express.

Here is the old code:

Code:
frmMain.Winsock.Send "Reg" & txtUsername & ":" & txtPassword & ":" & txtEmailAddress & vbFormFeed
What would be the equivalent of the same code using System.Net.Sockets in Visual Basic Express. I have already setup a connection and everything.