How to read a data from TCP/IP port

Question

Hi friends,

            How to read a data from a TCP/IP port through asp.net, If the data is received to the particular port, the application have to read the data and have to process that. 

            Say for example 127.0.0.7:3500, a data is going to send from external device, where my asp.net application have to read those data. Please help.

             (Please don t guide me through serial port)

Thanks in advance

Kannan.M