how to connect a Plc (Programmable Logical Controller) using C#.net program

Question

Hi Frnd's..Im new to network concept in c#.net Can anyone say how to connect a Plc (Programmable Logical Controller) using C#.net program.I need a Sample Projects and example Codes to connect a plc. Awaiting for ur Rply... Tks in Adv.. Samcaleb05.