Alarm Controller

Question

Hi.. I am creating an application in .NET .. It is something like an alarm controller. It uses a “relay server”, which is a device with some relay inputs and outputs and an Ethernet port on it. The device has motion sensors attached to the inputs and it is used in a manufacturing plant to detect motion. The guards run the application in a PC connected to the network and using TCPIP they connect to the device. When the sensors detect movement, guards are alerted by the software. I need to add some things to this application (graphics, maps and extra functionality). I have the following problems: 1) I need to convince my Clients that the application could be built in .NET. Could plz tell me what advantages i would have if i build it in .NET and not in any other langauge like Delphi. If it is .NET then what could i use for it.Could C# be a viable choice. 2) Where could i find an application like this..any sample project or documents related to this. 3) I searched the MSDN but could not find anything.Please could you suggest me as to how do i begin. Warm regards.. Sups.