Intergation of Biometric with Web Application

Question

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<UserInfo> 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;
            }  public ICollection<UserInfo> GetAllUserInfo(ZkemClient objZkeeper, int machineNumber)
        {
            string sdwEnrollNumber = string.Empty, sName = string.Empty, sPassword = string.Empty, sTmpData = string.Empty;
            int iPrivilege = 0, iTmpLength = 0, iFlag = 0, idwFingerIndex;
            bool bEnabled = false;

            ICollection<UserInfo> lstFPTemplates = new List<UserInfo>();

            objZkeeper.ReadAllUserID(machineNumber);
            objZkeeper.ReadAllTemplate(machineNumber);


                while (objZkeeper.SSR_GetAllUserInfo(machineNumber, out sdwEnrollNumber, out sName, out sPassword, out iPrivilege, out bEnabled))
                try
                {
                    for (idwFingerIndex = 0; idwFingerIndex < 10; idwFingerIndex++)
                    {
                        if (objZkeeper.GetUserTmpExStr(machineNumber, sdwEnrollNumber, idwFingerIndex, out iFlag, out sTmpData, out iTmpLength))
                        {
                            UserInfo fpInfo = new UserInfo();
                            fpInfo.MachineNumber = machineNumber;
                            fpInfo.EnrollNumber = sdwEnrollNumber;
                            fpInfo.Name = sName;
                            fpInfo.FingerIndex = idwFingerIndex;
                            fpInfo.TmpData = sTmpData;
                            fpInfo.Privelage = iPrivilege;
                            fpInfo.Password = sPassword;
                            fpInfo.Enabled = bEnabled;
                            fpInfo.iFlag = iFlag.ToString();

                            lstFPTemplates.Add(fpInfo);
                        }
                    }

                }
                catch (Exception ex)
                {

                }
            return lstFPTemplates;
        }