Intergation of Biometric with Web Application

Hi, I'm trying to integrate Biometric Device with my Web Application, but the issue is code works for Sdk, and a test project in WinForms but not working for my WebApplication, the debugger doesn't goes inside while loop.

try
{
//ShowStatusBar(string.Empty, true);
lblMessage.Text = "";
objZkeeper = new ZkemClient(RaiseDeviceEvent);
ICollection lstFingerPrintTemplates = manipulator.GetAllUserInfo(objZkeeper, int.Parse("4370"));
//DataTable dt = manipulator.GetAllUserInfo(objZkeeper, int.Parse(hdID.Value));
if (lstFingerPrintTemplates != null && lstFingerPrintTemplates.Count > 0)
{
//BindToGridView(lstFingerPrintTemplates);
GV_Attendance.DataSource = lstFingerPrintTemplates;
GV_Attendance.DataBind();
ShowStatusBar(lstFingerPrintTemplates.Count + " records found !!", true);
}
else
{
//DisplayListOutput("No records found");
lblMessage.Text = "Caution! No Record Found!";
pnlAlert.CssClass = "alert alert-warning";
pnlAlert.Visible = true;
}
}
catch (Exception ex)
{
//DisplayListOutput(ex.Message);
lblMessage.Text = "Can't Fetch the User Data!";
pnlAlert.CssClass = "alert alert-warning";
pnlAlert.Visible = true;
}
1. public ICollection GetAllUserInfo(ZkemClient objZkeeper, int machineNumber)
2. {
3. string sdwEnrollNumber = string.Empty, sName = string.Empty, sPassword = string.Empty, sTmpData = string.Empty;
4. int iPrivilege = 0, iTmpLength = 0, iFlag = 0, idwFingerIndex;
5. bool bEnabled = false;
7. ICollection lstFPTemplates = new List();
9. objZkeeper.ReadAllUserID(machineNumber);
10. objZkeeper.ReadAllTemplate(machineNumber);
13. while (objZkeeper.SSR_GetAllUserInfo(machineNumber, out sdwEnrollNumber, out sName, out sPassword, out iPrivilege, out bEnabled))
14. try
15. {
16. for (idwFingerIndex = 0; idwFingerIndex < 10; idwFingerIndex++)
17. {
18. if (objZkeeper.GetUserTmpExStr(machineNumber, sdwEnrollNumber, idwFingerIndex, out iFlag, out sTmpData, out iTmpLength))
19. {
20. UserInfo fpInfo = new UserInfo();
21. fpInfo.MachineNumber = machineNumber;
22. fpInfo.EnrollNumber = sdwEnrollNumber;
23. fpInfo.Name = sName;
24. fpInfo.FingerIndex = idwFingerIndex;
25. fpInfo.TmpData = sTmpData;
26. fpInfo.Privelage = iPrivilege;
27. fpInfo.Password = sPassword;
28. fpInfo.Enabled = bEnabled;
29. fpInfo.iFlag = iFlag.ToString();
31. lstFPTemplates.Add(fpInfo);
32. }
33. }
35. }
36. catch (Exception ex)
37. {
39. }
40. return lstFPTemplates;
41. }