Socket Connection

hihi.. i have some difficulty in resolving the socket connection. i have this code --->

imports system.Net
Imports system.Net.sockets
.
.

Dim _tcpClient as new TcpClient
_tcpClient.connect("152.226.138.189", 6969)
.
.


however, i got this error message :

"C:\Documents and Settings\User\My Documents\Visual Studio Projects\CrossfireApp9\bin\CrossfireApp9.exe CROSSFIRE - Field 'tcpClient' in type 'CrossfireApp9.EPG_HOME' is of an unsupported type 'System.Net.Sockets.TcpClient'."

i am using AppForge prog for coding. If the system is not supporting this code, what should i do instead.

thanks for all suggestion.

reagrds
regen