C# - COM Port Can't Be Opened In Asp

May 10, 2010

I following this article for sending SMS it is a winform application.. I have referenced all the Dll's to my asp.net application. I use an aspx page to detect a mobile device connected to a PC..... But it alwys shows COM 'n' Port could not be opened.

using SMS;
using GsmComm.GsmCommunication;
using GsmComm.PduConverter;
public partial class _Default : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
GsmCommMain comm = new GsmCommMain(6, 9600, 300);
if (!comm.IsConnected())
Response.Write("No Phone Connected");
SmsSubmitPdu pdu = new SmsSubmitPdu("test", "+919999999999", "");


I use the web development server that ships with Visual Studio... If go to Control Panel -> Phones & Modems -> Modems i could see my mobile connected in com6.. i have tested the winform application it works fine.Is this the answer? ASP.NET pages are supposed to work.What is happening over here is that when you click on open_com button, the ASP.NET page posts back to itself, executes the event handler i.e., opensthe port. Then when the page finishesprocessing the post back, it is unloaded. At this point the COM1 objects is also destroyed.

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